Nothing exists except atoms and empty space;everything else is opinion.

I would rather discover one scientific fact than become King of Persia.

Our sins are more easily remembered than our good deeds.

The pride of youth is in strength and beauty, the pride of old age is in discretion.

Tis hard to fight with anger, but the prudent man keeps it under control.

Do not trust all men, but trust men of worth; the former course is silly, the latter a mark of prudence.