"Let no one when young delay to study philosophy, nor when old grow weary of studying it. For no one is either too early or too late for the health of the soul."

"The wise man is not concerned with the quantity of life, but with its quality."

"It is folly for a man to pray to the gods for that which he has the power to obtain by himself."

"It is not possible for one to rid himself of his fears about the most important matters if he does not understand the nature of the whole, but is still in doubt about some of the things that are said …"

"Against all things it is possible to provide security, but as against death we all live in an unwalled city."