I will not be revenged, and this I owe to my enemy; but I will remember, and this I owe to myself.

Love may exist without jealousy, although this is rare: but jealousy may exist without love, and this is common; for jealousy can feed on that which is bitter no less than on that which is sweet, and is sustained by pride as often as by affection.

Revenge is a much more punctual paymaster than gratitude

The cynic who twitted Aristippus by observing that the philosopher who could dine on herbs might despise the company of a king, was well replied to by Aristippus, when he remarked that the philosopher who could enjoy the company or a king might also despise a dinner of herbs.

Those who bequeath unto themselves a pompous funeral, are at just so much expense to inform the world of something that had much better be concealed; namely, that their vanity has survived themselves.

What would you do if you knew for sure that no one would ever find out?

It is almost as difficult to make a man unlearn his errors as his knowledge.