A great man need not be virtuous, nor his opinions right, but he must have a firm mind, a distinctive luminous character.

Theory helps us to bear our ignorance of facts.

That life is worth living is the most necessary of assumptions, and were it not assumed, the most impossible of conclusions.

If all art aspires to the condition of music, all the sciences aspire to the condition of mathematics.

Half our standards come from our first masters, and the other half from our first loves.

Art like life, should be free, since both are experimental.

A soul is but the last bubble of a long fermentation in the world.