Non nobis solum nati sumus. (Not for ourselves alone are we born.)

There is pleasure in calm remembrance of a past sorrow.

There is no moment without some duty.

More is lost by indecision than wrong decision. Indecision is the thief of opportunity. It will steal you blind.

Nature abhors annihilation.

Friendship is the only thing in the world concerning the usefulness of which all mankind are agreed.

I do not understand what the man who is happy wants in order to be happier.