Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

I do not much wish well to discoveries, for I am always afraid they will end in conquest and robbery.

A simile, to be perfect, must both illustrate and ennoble the subject; must show it to the understanding in a clearer view, and display it to the fancy with greater dignity; but either of these qualities may be sufficient to recommend it.... That it may be complete, it is required to exhibit, independently of its references, a pleasing image; for a simile is said to be a short episode.

The faults of a man loved or honoured sometimes steal secretly and imperceptibly upon the wise and virtuous, but by injudicious fondness or thoughtless vanity are adopted with design.

Exercise is labor without weariness.

Prepare for death, if here at night you roam, and sign your will before you sup from home.

Sleep is a state in which a great part of every life is passed. No animal has yet been discovered, whose existence is not varied with intervals of insensibility; and some late philosophers have extended the empire of sleep over the vegetable world.