He who truly believes that which prompts him to an action has looked upon the action to lust after it, he has committed it already in his heart.

We may always depend on it that algebra, which cannot be translated into good English and sound common sense, is bad algebra.

We feel much happier and more secure when we think we know precisely what to do, no matter what happens, then when we have lost our way and do not know where to turn.

No simplicity of mind, no obscurity of station, can escape the universal duty of questioning all that we believe.

There is one thing in the world more wicked than the desire to command, and that is the will to obey.

If a man, holding a belief which he was taught in childhood or persuaded of afterwards, keeps down and pushes away any doubts which arise about it in his mind, purposely avoids the reading of books and the company of men that call in question or discuss it, and regards as impious those questions which cannot easily be asked without disturbing it - the life of that man is one long sin against mankind.

If I steal money from any person, there may be no harm done from the mere transfer of possession; he may not feel the loss, or it may prevent him from using the money badly. But I cannot help doing this great wrong towards Man, that I make myself dishonest.