Democritus

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

Our sins are more easily remembered than our good deeds.

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

The pride of youth is in strength and beauty, the pride of old age is in discretion.
Democritus - Fragment 145
Word is a shadow of a deed.

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

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

- Democritus