The things you really need are few and easy to come by; but the things you can imagine you need are infinite, and you will never be satisfied.

Neither one should hesitate about dedicating oneself to philosophy when young, nor should get tired of doing it when one's old, because no one is ever too young or too old to reach one's soul's healthy.

There is no such thing as justice or injustice among those beasts that cannot make agreements not to injure or be injured. This is also true of those tribes that are unable or unwilling to make agreements not to injure or be injured.

There is no such thing as justice in the abstract; it is merely a compact between men in their various relations with each other, in whatever circumstances they may be, that they will neither injure nor be injured.

It is not the young man who should be considered fortunate but the old man who has lived well, because the young man in his prime wanders much by chance, vacillating in his beliefs, while the old man has docked in the harbor, having safeguarded his true happiness.

He who has peace of mind disturbs neither himself nor another.

Happiness is man's greatest aim in life. Tranquility and rationality are the cornerstones of happiness.