Justice is a contract of expediency, entered upon to prevent men harming or being harmed.
Let no one delay the study of philosophy while young nor weary of it when old.
Earthquakes may be brought about because wind is caught up in the earth, so the earth is dislocated in small masses and is continually shaken, and that causes it to sway.
We cannot live pleasantly without living wisely and nobly and righteously.
To eat and drink without a friend is to devour like the lion and the wolf.
Nothing is enough for the man to whom enough is too little.