Poor is the nation that has no heroes, but poorer still is the nation that having heroes, fails to remember and honor them.

There is in fact a true law namely right reason, which is in accordance with nature, applies to all men and is unchangeable and eternal. ... It will not lay down one rule at Rome and another at Athens, nor will it be one rule today and another tomorrow. But there will be one law eternal and unchangeable binding all times and upon all peoples.

The sinews of war are infinite money.

We rejoice in the joys of our friends as much as we do our own, and we are equally grieved at their sorrows. Wherefore the wise people will feel toward their friends as they do toward themselves, and whatever labor they would encounter with a view to their own pleasure, they will encounter also for the sake of their friends.

Art is born of the observation and investigation of nature.

The whole life of a philosopher is the meditation of his death.

Old age by nature is rather talkative.