Give Honest and Sincere Appreciation.
— Dale Carnegie
Astonishing Friendship Sincerity quotations
The rule of friendship means there should be mutual sympathy between them, each supplying what the other lacks and trying to benefit the other, always using friendly and sincere words.

If you would win a man to your cause, first convince him that you are his sincere friend.

There is no man so friendless but that he can find a friend sincere enough to tell him disagreeable truths.
A friend is a person with whom I may be sincere. Before him I may think aloud.
Some friends leave footprints in your heart

Of all the things that are beyond my power, I value nothing more highly than to be allowed the honor of entering into bonds of friendship with people who sincerely love truth. For, of things beyond our power, I believe there is nothing in the world which we can love with tranquility except such men.
Large was his bounty, and his soul sincere, Heaven did a recompense as largely send: He gave to mis'ry (all he had) a tear, He gained from Heav'n ('t was all he wish'd) a friend.
The Way of a Warrior is based on humanity, love, and sincerity;
the heart of martial valor is true bravery, wisdom, love, and friendship. Emphasis on the physical aspects of warriorship is futile, for the power of the body is always limited.

If we merely try to impress people and get people interested in us, we will never have many true, sincere friends. Friends, real friends, are not made that way.
To arrive at perfection, a man should have very sincere friends or inveterate enemies; because he would be made sensible of his good or ill conduct, either by the censures of the one or the admonitions of the other.
Gracias, danke, merci - whatever language is spoken, "thank you" frequently expressed will cheer your spirit, broaden your friendships, and lift your lives to a higher pathway as you journey toward perfection. There is a simplicity - even a sincerity - when "thank you" is spoken.

For in religion as in friendship, they who profess most are ever the least sincere.
Sincere friendship towards God, in all who believe him to be properly an intelligent, willing being, does most apparently, directly, and strongly incline to prayer; and it no less disposes the heart strongly to desire to have our infinitely glorious.
Statesman, yet friend to truth! of soul sincere, In action faithful, and in honour clear; Who broke no promise, serv'd no private end, Who gain'd no title, and who lost no friend.

Officious, innocent, sincere, Of every friendless name the friend.
Neither the army nor the treasury, but friends, are the true supports of the throne; for friends cannot be collected by force of arms, nor purchased with money; they are the offspring of kindness and sincerity.
A Friendship that's sincere are true.
Gives joy like nothing else will do; That's why glad hearts look up and send A prayer of thanks for faithful friends.

Toward all other nations, large and small, our attitude must be one of cordial and sincere friendship. We must show not only in our words, but in our deeds, that we are earnestly desirous of securing their good will by acting toward them in a spirit of just and generous recognition of all their rights.
It is with sincere affection or friendship as with ghosts and apparitions,--a thing that everybody talks of, and scarce any hath seen.
We should never stand upon ceremony with sincerity.
We should never cheat and insult and banish one another by our meanness, if there were present the kernel of worth and friendliness. We should not meet thus in haste.

Truth to me was dead, God had never lived, life was full of pain, and death was the end of life. As a young Atheist, I sincerely believed that man had created God to fill the gaps in knowledge that would never be spanned by experience, reason, or science. In 1983 the God who pursues those who deny him interrupted my existence, he captured my soul with raw love. Two decades later, God's tangible friendship still amazes me. To deny his existence I'd have to first deny my own.
How can sincerity be a condition of friendship? A taste for truth at any cost is a passion which spares nothing.
I have discovered that my interest in my dear pupil, Mabel, has ripened into a far deeper feeling than that of mere friendship. In fact, I know that I have learned to love her very sincerely.
Being able to make a sincere apology - one that says, "Yes, I get it;
I screwed up. Your feelings make sense, and I'm taking this seriously" - is at the heart of being successful in leadership, parenting, and friendship, as well as our own integrity and self-worth. And the failure to apologize? Even a good relationship will suffer quietly - because we really feel it when someone won't take responsibility for what they said, or didn't say.
It is not for minds like ours to give or to receive flatter;
yet the praises of sincerity have ever been permitted to the voice of friendship
The reason we do not let our friends see the very bottom of our hearts is not so much distrust of them as distrust of ourselves.

The boldest stroke and best act of friendship is not to disclose our own failings to a friend, but to show him his own.
Human life is thus only a perpetual illusion;
men deceive and flatter each other. No one speaks of us in our presence as he does of us in our absence. Human society is founded on mutual deceit; few friendships would endure if each knew what his friend said of him in his absence, although he then spoke in sincerity and without passion.
I often accuse my finest acquaintances of an immense frivolity;
for, while there are manners and compliments we do not meet, we donot teach one another the lessons of honesty and sincerity that the brutes do, or of steadiness and solidity that the rocks do. The fault is commonly mutual; however, for we do not habitually demand any more of each other.

We never exchange more than three words with a Friend in our lives on that level to which our thoughts and feelings almost habitually rise.
There are three friendships which are advantageous, and three which are injurious. Friendship with the upright; friendship with the sincere; and friendship with the man of much observation: these are advantageous. Friendship with the man of specious airs; friendship with the insinuatingly soft; and friendship with the glib-tongued: these are injurious.
The parable of the talents is a good analogy of what happens when we give.
When we merely try to hold on to what is given or entrusted to us, life may seem to take away even that. But when we choose to use what life has given us, the return of abundance can include friendship, companionship, financial blessings, homes, transportation, and security in wonderful ways. The universe holds nothing back from the one who lovingly and sincerely gives.
Genuine human friendship is on the basis of human affection, irrespective of your position. Therefore, the more you show concern about the welfare and rights of others, the more you are a genuine friend. The more you remain open and sincere, then ultimately more benefits will come to you. If you forget or do not bother about others, then eventually you will lose your own benefit.
Ceremony and great professing renders friendship as much suspect as it does religion.