There is no more expensive thing than a free gift.

I do not teach. I relate.

I see men ordinarily more eager to discover a reason for things than to find out whether the things are so.

I agree that we should work and prolong the functions of life as far as we can, and hope that Death may find me planting my cabbages, but indifferent to him and still more to the unfinished state of my garden.

The most universal quality is diversity.

The worst condition of humans is when they lose knowledge and control of themselves.

Socrates ... brought human wisdom back down from heaven, where she was wasting her time, and restored her to man.... It is impossible to go back further and lower. He did a great favor to human nature by showing how much it can do by itself.