Age imprints more wrinkles in the mind than it does on the face.

There is no pleasure to me without communication: there is not so much as a sprightly thought comes into my mind that it does not grieve me to have produced alone, and that I have no one to tell it to.

My trade and art is to live.

Stubborn and ardent clinging to one's opinion is the best proof of stupidity.

Let us permit nature to have her way. She understands her business better than we do.