Galileo called doubt the father of invention; it is certainly the pioneer.

Complaint is. more contemptible than pitiful.

Without death in the world, existence in it would soon become, through over-population, the most frightful of curses.

The trouble with men of sense is that they are so dreadfully in earnest all the while.

There is no sense of weariness like that which closes in a day of eager and unintermittent pursuit of pleasure. The apple is eaten, but "the core sticks in the throat." Expectation has then given way to ennui, appetite to satiety.

The worst deluded are the self-deluded.

Good men have the fewest fears. He has but one great fear who fears to do wrong; he has a thousand who has overcome it.