We are very apt to measure ourselves by our aspiration instead of our performance. But in truth the conduct of our lives is the only proof of the sincerity of our hearts.

The merit of originality is not novelty; it is sincerity.

Sincerity and truth are the basis of every virtue.

The great man fights the elements in his time that hinder his own greatness, in other words his own freedom and sincerity.

It is dangerous to be sincere unless you are also stupid.

Every man alone is sincere. At the entrance of a second person, hypocrisy begins.

I only desire sincere relations with the worthiest of my acquaintance, that they may give me an opportunity once in a year to speak the truth.

Truth of a modest sort I can promise you, and also sincerity. That complete, praiseworthy sincerity which, while it delivers one into the hands of one's enemies, is as likely as not to embroil one with one's friends.

You know I say just what I think, and nothing more and less. I cannot say one thing and mean another.

I sat at a table where were rich food and wine in abundance, and obsequious attendance, but sincerity and truth were not; and I went away hungry from the inhospitable board.