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

No power and no treasure can outweigh the extension of our knowledge.

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

Happiness resides not in possessions, and not in gold, happiness dwells in the soul.

We think there is color, we think there is sweet, we think there is bitter, but in reality there are atoms and a void.

One great difference between a wise man and a fool is, the former only wishes for what he may possibly obtain; the latter desires impossibilities.

It is hard to fight desire; but to control it is the sign of a reasonable man.