Thought makes the whole dignity of man; therefore endeavor to think well, that is the only morality.

[On vanity:] The nose of Cleopatra: if it had been shorter, the face of the earth would have changed.

The greater intellect one has, the more originality one finds in men. Ordinary persons find no difference between men.

All the good maxims which are in the world fail when applied to one's self.

Our notion of symmetry is derived form the human face. Hence, we demand symmetry horizontally and in breadth only, not vertically nor in depth.

The world is satisfied with words, few care to dive beneath the surface.

The heart has its order, the mind has its own, which uses principles and demonstrations. The heart has a different one. We do not prove that we ought to be loved by setting out in order the causes of love; that would be absurd.