“The most foolish of all errors is for clever young men to believe that they forfeit their originality in recognising a truth which has already been recognised by others.”

“Error is related to truth as sleeping is to waking. I have observed that when one has been in error, one turns to truth as though revitalized.”

“Truth is contrary to our nature, not so error, and this for a very simple reason: truth demands that we should recognize ourselves as limited, error flatters us that, in one way or another, we are unlimited.”

“But who will dare to speak the truth out clear?The few who anything of truth have learned,And foolishly did not keep truth concealed,Their thoughts and visions to the common herd revealed,Since time began we've crucified and burned”

“Fools and wise-folk are alike harmless. It is the half-wise, and the half-foolish, who are the most dangerous.”

“All intelligent thoughts have already been thought; what is necessary is only to try to think them again.”

“The deepest, the only theme of human history, compared to which all others are of subordinate importance, is the conflict of scepticism with faith.”