Scrub them off every once in a while, or the light won't come in.
A young man is a theory, an old man is a fact.
In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go.
I never guess. It is a shocking habit -- destructive to the logical faculty.
Some theories are good for nothing except to be argued about.
What most people don't seem to realize is that there is just as much money to be made out of the wreckage of a civilization as from the upbuilding of one.
Let us work without theorizing, 'Tis the only way to make life endurable.
I have learned throughout my life as a composer chiefly through my mistakes and pursuits of false assumptions, not by my exposure to founts of wisdom and knowledge.
Euclid taught me that without assumptions there is no proof.
Therefore, in any argument, examine the assumptions.
The narrower the mind, the broader the statement.
No theory is good unless it permits, not rest, but the greatest work.
No theory is good except on condition that one use it to go on beyond.
Theories that go counter to the facts of human nature are foredoomed.
Even for practical purposes theory generally turns out the most important thing in the end.
A theory is no more like a fact than a photograph is like a person.
Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates.
Socrates thought and so do I that the wisest theory about the gods is no theory at all.
I never attempt to make money on the stock market.
I buy on the assumption that they could close the market the next day and not reopen it for five years.
I do not like the word tolerance, but could not think of a better one.
Tolerance implies a gratuitous assumption of the inferiority of other faiths to one
If we all worked on the assumption that what is accepted as true is really true, there would be little hope of advance.
Most people assume that women are responsible for households and child care.
Most couples operate that way - not all. That fundamental assumption holds women back.
Society cannot continue to disable themselves through their need to categorize people or make assumptions as to another individual's abilities.
Begin challenging your own assumptions.
Your assumptions are your windows on the world. Scrub them off every once in awhile, or the light won't come in.
We must strive for literacy and education that teach us to never quit questioning and probing at the assumptions of the day.
Another key element of human ecology is the inviolability of human life, especially at its beginning and its end. The Holy See insistently proclaims that the first and most fundamental of all human rights is the right to life, and that when this right is denied all other rights are threatened. The assumption that abortion and euthanasia are human rights deserving legislative sanction is seen by the Holy See as a contradiction which amounts to a denial of the human dignity and freedom which the law is supposed to protect. A society will be judged on the basis of how it treats its weakest members; and among the most vulnerable are surely the unborn and the dying.
Treat with utmost respect your power of forming opinions, for this power alone guards you against making assumptions that are contrary to nature and judgments that overthrow the rule of reason.
There never comes a point where a theory can be said to be true.
The most that one can claim for any theory is that it has shared the successes of all its rivals and that it has passed at least one test which they have failed.