The highest level than can be reached by a mediocre but experienced mind is a talent for uncovering the weaknesses of those greater than itself.

So-called professional mathematicians have, in their reliance on the relative incapacity of the rest of mankind, acquired for themselves a reputation for profundity very similar to the reputation for sanctity possessed by theologians.

A book which, above all others in the world, should be forbidden, is a catalogue of forbidden books.

I believe that man is in the last resort so free a being that his right to be what he believes himself to be cannot be contested.

Much reading has brought upon us a learned barbarism.

To receive applause for works which do not demand all our powers hinders our advance towards a perfecting of our spirit. It usually means that thereafter we stand still.

Brevity: To say at once whatever is to be said.