110+ Galileo Galilei Quotes (Observational, Innovative And Pioneering)

Galileo Galilei was an Italian scientist and philosopher who made pioneering observations of nature with long-lasting implications for the study of physics, astronomy, and philosophy. He was the first to use a telescope to observe the night sky and make discoveries that contradicted the accepted beliefs of the time, including the notion that the Earth was the center of the universe. His discoveries were met with much opposition from the Catholic Church, and he was eventually put under house arrest for the remainder of his life.

Top 10 Galileo Galilei Quotes

1. All truths are easy to understand once they are discovered; the point is to discover them.
2. I have never met a man so ignorant that I couldn't learn something from him.
3. The laws of nature are written by the hand of God in the language of mathematics.
4. The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do.
5. Knowing thyself, that is the greatest wisdom.
6. To be humane, we must ever be ready to pronounce that wise, ingenious and modest statement 'I do not know'.
7. You cannot teach a man anything; you can only help him find it within himself.
8. Mathematics is the language with which God has written the universe.
9. The greatest wisdom is to get to know oneself.
10. In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.

Galileo Galilei Image Quotes

You cannot teach a man anything; you can only help him find it within himself. — Galileo Galilei

Measure what is measurable, and make measurable what is not so. — Galileo Galilei

Galileo Galilei Short Quotes

• Measure what is measurable, and make measurable what is not so.
• Holy Scripture could never lie or err...its decrees are of absolute and inviolable truth.
• It is surely harmful to souls to make it a heresy to believe what is proved.
• The Milky Way is nothing else but a mass of innumerable stars planted together in clusters.
• It is a beautiful and delightful sight to behold the body of the Moon.
• Wine is sunlight, held together by water.
• Scripture is a book about going to Heaven. It's not a book about how the heavens go.
• By denying scientific principles, one may maintain any paradox.
• Nature's great book is written in mathematics.
• Doubt is the father of invention.

Galileo Galilei Famous Quotes And Sayings

You cannot teach a man anything; you can only help him find it within himself. — Galileo Galilei

The prohibition of science would be contrary to the Bible, which in hundreds of places teaches us how the greatness and the glory of God shine forth marvelously in all His works, and is to be read above all in the open book of the heavens. — Galileo Galilei

Long experience has taught me this about the status of mankind with regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them, while on the other hand to know and understand a multitude of things renders men cautious in passing judgment upon anything new. — Galileo Galilei

In my studies of astronomy and philosophy I hold this opinion about the universe, that the Sun remains fixed in the centre of the circle of heavenly bodies, without changing its place; and the Earth, turning upon itself, moves round the Sun. — Galileo Galilei

The vain presumption of understanding everything can have no other basis than never having understood anything. For anyone who had ever experienced just once the perfect understanding of one single thing, and had truly tasted how knowledge is accomplished, would recognize that of the infinity of other truths he understands nothing. — Galileo Galilei

I wish, my dear Kepler, that we could have a good laugh together at the extraordinary stupidity of the mob. What do you think of the foremost philosophers of this University? In spite of my oft-repeated efforts and invitations, they have refused, with the obstinacy of a glutted adder, to look at the planets or the Moon or my glass [telescope]. — Galileo Galilei

With regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them. — Galileo Galilei

It is very pious to say and prudent to affirm that the holy Bible can never speak untruth -- whenever its true meaning is understood. But I believe nobody will deny that it is often very abstruse, and may say things which are quite different from wha. — Galileo Galilei

I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations. — Galileo Galilei

Nature is relentless and unchangeable, and it is indifferent as to whether its hidden reasons and actions are understandable to man or not. — Galileo Galilei

Among the great men who have philosophized about [the action of the tides], the one who surprised me most is Kepler. He was a person of independent genius, [but he] became interested in the action of the moon on the water, and in other occult phenomena, and similar childishness. — Galileo Galilei

The laws of Nature are written in the language of mathematics...the symbols are triangles, circles and other geometrical figures, without whose help it is impossible to comprehend a single word. — Galileo Galilei

But let us remember that we are dealing with infinities and indivisibles both of which transcend our finite understanding, the former on account of their magnitude, the latter because of their smallness. — Galileo Galilei

Philosophy itself cannot but benefit from our disputes, for if our conceptions prove true, new achievements will be made; if false, their refutation will further confirm the original doctrines. — Galileo Galilei

I therefore concluded, and decided unhesitatingly, that there are three stars in the heavens moving about Jupiter, as Venus and Mercury about the Sun; which at length was established as clear as daylight by numerous other observations. — Galileo Galilei

The number of people that can reason well is much smaller than those that can reason badly. If reasoning were like hauling rocks, then several reasoners might be better than one. But reasoning isn't like hauling rocks, it's like, it's like racing, where a single, galloping Barbary steed easily outruns a hundred wagon-pulling horses. — Galileo Galilei

Being infinitely amazed, so do I give thanks to God, Who has been pleased to make me the first observer of marvelous things, unrevealed to bygone ages. — Galileo Galilei

Nature . . . is inexorable and immutable; she never transgresses the laws imposed upon her, nor cares a whit whether her abstruse reasons and methods of operations are understandable to men. — Galileo Galilei

But some, besides allegiance to their original error, possess I know not what fanciful interest in remaining hostile not so much toward the things in question as toward their discoverer. — Galileo Galilei

Showing a greater fondness for their own opinions than for truth, they sought to deny and disprove the new things which, if they had cared to look for themselves, their own senses would have demonstrated to them. — Galileo Galilei

It vexes me when they would constrain science by the authority of the Scriptures, and yet do not consider themselves bound to answer reason and experiment. — Galileo Galilei

The doctrine that the earth is neither the center of the universe nor immovable, but moves even with a daily rotation, is absurd, and both philosophically and theologically false, and at the least an error of faith. — Galileo Galilei

I am inclined to think that the authority of Holy Scripture is intended to convince men of those truths which are necessary for their salvation, which, being far above man's understanding, can not be made credible by any learning, or any other means than revelation by the Holy Spirit. — Galileo Galilei

The difficulties in the study of the infinite arise because we attempt, with our finite minds, to discuss the infinite, assigning to it those properties which we give to the finite and limited; but this...is wrong, for we cannot speak of infinite quantities as being the one greater or less than or equal to another. — Galileo Galilei

I, Galileo, son of the late Vicenzo Galilei, swear that I never said that the prime numbers are useless. What I said was that you cannot count lunar craters by counting 2, 3, 5, 7. — Galileo Galilei

The surface of the Moon is not smooth, uniform, and precisely spherical as a great number of philosophers believe it to be, but is uneven, rough, and full of cavities and prominences, being not unlike the face of the Earth, relieved by chains of mountains and deep valleys. — Galileo Galilei

The intention of the Holy Ghost is to teach us how one goes to heaven, not how heaven goes. — Galileo Galilei

To command their professors of astronomy to refute their own observations is to command them not to see what they do see and not to understand what they do understand. — Galileo Galilei

In time you may discover everything that can be discovered, and still your progress will only be progress away from humanity. The distance between you and them can one day become so great that your joyous cry over some new gain could be answered by an universal shriek of horror. — Galileo Galilei

Facts which at first seem improbable will, even on scant explanation, drop the cloak which has hidden them and stand forth in naked and simple beauty. — Galileo Galilei

I am certainly interested in a tribunal in which, for having used my reason, I was deemed little less than a heretic. Who knows but men will reduce me from the profession of a philosopher to that of historian of the Inquisition! — Galileo Galilei

I would beg the wise and learned fathers [of the church] to consider with all diligence the difference which exists between matters of mere opinion and matters of demonstration. — Galileo Galilei

We must say that there are as many squares as there are numbers. — Galileo Galilei

I abjure with a sincere heart and unfeigned faith, I curse and detest the said errors and heresies, and generally all and every error and sect contrary to the Holy Catholic Church. — Galileo Galilei

Some, merely to contradict what I had said, did not scruple to cast doubt upon things they had seen with their own eyes again and again. — Galileo Galilei

To excite in us tastes, odors, and sounds I believe that nothing is required in external bodies except shapes, numbers, and slow or rapid movements. ... if ears, tongues, and noses were removed, shapes and numbers and motions would remain, but not odors or tastes or sounds. — Galileo Galilei

The Universe is a grand book which cannot be read until one first learns to comprehend the language and become familiar with the characters in which it is composed. It is written in the language of mathematics. — Galileo Galilei

It reveals to me the causes of many natural phenomena that are entirely incomprehensible in the light of the generally accepted hypotheses. To refute the latter I collected many proofs, but I do not publish them ... I would dare to publish my speculations if there were people men like you. — Galileo Galilei

[Copernicus] did not ignore the Bible, but he knew very well that if his doctrine were proved, then it could not contradict the Scriptures when they were rightly understood. — Galileo Galilei

That sculpture is more admirable than painting for the reason that it contains relief and painting does not is completely false. ... Rather, how much more admirable the painting must be considered, if having no relief at all, it appears to have as much as sculpture! — Galileo Galilei

I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use. — Galileo Galilei

Well, since paradoxes are at hand, let us see how it might be demonstrated that in a finite continuous extension it is not impossible for infinitely many voids to be found. — Galileo Galilei

And yet it moves. — Galileo Galilei

When the moon is ninety degrees away from the sun it sees but half the earth illuminated (the western half). For the other (the eastern half) is enveloped in night. Hence the moon itself is illuminated less brightly from the earth, and as a result its secondary light appears fainter to us. — Galileo Galilei

For my part I consider the earth very noble and admirable precisely because of the diverse alterations, changes, generations, etc. that occur in it incessantly. — Galileo Galilei

I give infinite thanks to God, who has been pleased to make me the first observer of marvelous things. — Galileo Galilei

Their vain presumption of knowing all can take beginning solely from their never having known anything; for if one has but once experienced the perfect knowledge of one thing, and truly tasted what it is to know, he shall perceive that of infinite other conclusions he understands not so much as one. — Galileo Galilei

Who would set a limit to the mind of man? Who would dare assert that we know all there is to be known? — Galileo Galilei

The Bible shows the way to go to heaven, not the way the heavens go. — Galileo Galilei

But, because my private lectures and domestic pupils are a great hinderance and intteruption of my studies, I wish to live entirely exempt from the former, and in great measure from the latter. ... in short, I should wish to gain my bread from my writings. — Galileo Galilei

If experiments are performed thousands of times at all seasons and in every place without once producing the effects mentioned by your philosophers, poets, and historians, this will mean nothing and we must believe their words rather than our own eyes? — Galileo Galilei

Names and attributes must be accommodated to the essence of things, and not the essence to the names, since things come first and names afterwards. — Galileo Galilei

My dear Kepler, what would you say of the learned here, who, replete with the pertinacity of the asp, have steadfastly refused to cast a glance through the telescope? What shall we make of this? Shall we laugh, or shall we cry? — Galileo Galilei

It has always seemed to me extreme presumptuousness on the part of those who want to make human ability the measure of what nature can and knows how to do, since, when one comes down to it, there is not one effect in nature, no matter how small, that even the most speculative minds can fully understand. — Galileo Galilei

Mathematics is the key and door to the sciences. — Galileo Galilei

I notice that young men go to the universities in order to become doctors or philosophers or anything, so long as it is a title, and that many go in for those professions who are utterly unfit for them, while others who would be very competent are prevented by business or their daily cares, which keep them away from letters. — Galileo Galilei

You cannot teach a person something he does not already know, you can only bring what he does know to his awareness. — Galileo Galilei

I do not think it is necessary to believe that the same God who has given us our senses, reason, and intelligence wished us to abandon their use, giving us by some other means the information that we could gain through them. — Galileo Galilei

I would say here something that was heard from an ecclesiastic of the most eminent degree: The intention of the Holy Spirit is to teach us how one goes to heaven, not how the heavens go. — Galileo Galilei

Surely it is a great thing to increase the numerous host of fixed stars previously visible to the unaided vision, adding countless more which have never before been seen, exposing these plainly to the eye in numbers ten times exceeding the old and familiar stars. — Galileo Galilei

If you could see the earth illuminated when you were in a place as dark as night, it would look to you more splendid than the moon. — Galileo Galilei

In the long run my observations have convinced me that some men, reasoning preposterously, first establish some conclusion in their minds which, either because of its being their own or because of their having received it from some person who has their entire confidence, impresses them so deeply that one finds it impossible ever to get it out of their heads. — Galileo Galilei

Where the senses fail us, reason must step in. — Galileo Galilei

The Grand Duke [of Tuscany] ...after observing the Medicaean plants several times with me ... has now invited me to attach myself to him with the annual salary of one thousand florins, and with the title of Philosopher and Principal Mathematicial to His Highness; without the duties of office to perform, but with the most complete leisure; so that I can complete my Treatises. — Galileo Galilei

Holy Writ was intended to teach men how to go to Heaven not how the heavens go. — Galileo Galilei

The number of the fixed stars which observers have been able to see without artificial powers of sight up to this day can be counted. It is therefore decidedly a great feat to add to their number, and to set distinctly before the eyes other stars in myriads, which have never been seen before, and which surpass the old, previously known stars in number more than ten times. — Galileo Galilei

There are those who reason well, but they are greatly outnumbered by those who reason badly. — Galileo Galilei

Measure what can be measured, and make measureable what cannot be measured. — Galileo Galilei

It is necessary for the Bible, in order to be accommodated to the understanding of every man, to speak many things which appear to differ from the absolute truth so far as the bare meaning of the words is concerned. — Galileo Galilei

Infinities and indivisibles transcend our finite understanding, the former on account of their magnitude, the latter because of their smallness; Imagine what they are when combined. — Galileo Galilei

If I were again beginning my studies, I would follow the advice of Plato and start with mathematics. — Galileo Galilei

Surely, God could have caused birds to fly with their bones made of solid gold, with their veins full of quicksilver, with their flesh heavier than lead, and with their wings exceedingly small. He did not, and that ought to show something. It is only in order to shield your ignorance that you put the Lord at every turn to the refuge of a miracle. — Galileo Galilei

To understand the Universe, you must understand the language in which it's written, the language of Mathematics. — Galileo Galilei

God is known by nature in his works, and by doctrine in his revealed word. — Galileo Galilei

If there were as great a scarcity of soil as of jewels or precious metals, there would not be a prince who would not spend a bushel of diamonds and rubies and a cartload of gold just to have enough earth to plant a jasmine in a little pot, or to sow an orange seed and watch it sprout, grow, and produce its handsome leaves, its fragrant flowers, and fine fruit. — Galileo Galilei

The Divine intellect indeed knows infinitely more propositions [than we can ever know]. But with regard to those few which the human intellect does understand, I believe that its knowledge equals the Divine in objective certainty. — Galileo Galilei

Vision, I say, is related to light itself. But of this sensation and the things pertaining to it, I pretend to understand but little; and since even a long time would not suffice to explain that trifle, or even to hint at an explanation, I pass over this in silence. — Galileo Galilei

One can understand nature only when one has learned the language and the signs in which it speaks to us; but this language is mathematics and these signs are methematical figures. — Galileo Galilei

The book of nature is written in the language of mathematics. — Galileo Galilei

They who depend upon manifest observations will philosophize better than those who persist in opinions repugnant to the senses. — Galileo Galilei

The hypothesis is pretty; its only fault is that it is neither demonstrated nor demonstrable. Who does not see that this is purely arbitrary fiction that puts nothingness as existing and proposes nothing more than simple noncontradiciton? — Galileo Galilei

E pur si muove. "Albeit It does move". (That's what Galileo purportedly muttered after torturers forced him to recant his theory that the earth orbits the sun.) — Galileo Galilei

The deeper I go in considering the vanities of popular reasoning, the lighter and more foolish I find them. What greater stupidity can be imagined than that of calling jewels, silver, and gold "precious," and earth and soil "base"? — Galileo Galilei

Take note, theologians, that in your desire to make matters of faith out of propositions relating to the fixity of sun and earth you run the risk of eventually having to condemn as heretics those who would declare the earth to stand still and the sun to change position-eventually, I say, at such a time as it might be physically or logically proved that the earth moves and the sun stands still. — Galileo Galilei

I truly believe the book of philosophy to be that which stands perpetually open before our eyes, though since it is written in characters different from those of our alphabet it cannot be read by everyone. — Galileo Galilei

You can't teach anybody anything, only make them realize the answers are already inside them. — Galileo Galilei

The earth, in fair and grateful exchange, pays back to the moon an illumination similar to that which it receives from her throughout nearly all the darkest gloom of the night. — Galileo Galilei

See now the power of truth. — Galileo Galilei

He who looks the higher is the more highly distinguished, and turning over the great book of nature (which is the proper object of philosophy) is the way to elevate one's gaze. — Galileo Galilei

Nature...does not act by means of many things when it can do so by means of a few. — Galileo Galilei

Spots are on the surface of the solar body where they are produced and also dissolved, some in shorter and others in longer periods. They are carried around the Sun; an important occurrence in itself. — Galileo Galilei

Life Lessons by Galileo Galilei

1. Galileo Galilei taught us to never be afraid to challenge the status quo, even if it means facing opposition and ridicule.
2. He showed us that it is important to be persistent and passionate in our pursuits, no matter how difficult the journey may be.
3. He demonstrated the importance of having a curious and open mind, and that even the most revolutionary ideas can be proven with careful observation and experimentation.