He who loves his neighbor burns his heart, and the heart, like green wood, groans when it burns, and distills itself in tears. There is no point in taking opium; it is better to put salt and vinegar in the soul's wound, for if you fall asleep and no longer feel the pain, then you no longer exist. And the point is to exist.

The greatest height of heroism to which an individual, like a people, can attain is to know how to face ridicule.

The supreme triumph of reason is to cast doubt upon its own validity.

The only way to give finality to the world is to give it consciousness.

A lot of good arguments are spoiled by some fool who knows what he is talking about.

Knowledge for the sake of knowledge! Truth for truth's sake! This is inhuman.

The only reactionaries are those who find themselves at home in the present.