What is it that is most beautiful? - The Universe; for it is the work of God. What is most powerful? - Necessity; because it triumphs over all things. What is most difficult? - To know one's self. What is most easy? - To give advice. What method must we take to lead a good life? - To do nothing we would condemn in others. What is necessary to happiness? - A sound body and a contented mind.

The most difficult thing in life is to know yourself.

There are three attributes for which I am grateful to Fortune: that I was born, first, human and not animal; second, man and not woman; and third, Greek and not barbarian.

The past is certain, the future obscure.

I will be sufficiently rewarded if when telling it to others you will not claim the discovery as your own, but will say it was mine.

Take Time by the forelock.

I did not become a father because I am fond of children.