By a tranquil mind I mean nothing else than a mind well ordered.

Do not act as if you were going to live ten thousand years. Death hangs over you. While you live, while it is in your power, be good.

I search after truth, by which man never yet was harmed.

If any man can convince me and bring home to me that I do not think or act aright, gladly will I change; for I search after truth, by which man never yet was harmed. But he is harmed who abideth on still in his deception and ignorance.

Think of what you have rather than of what you lack. Of the things you have, select the best and then reflect how eagerly you would have sought them if you did not have them.

Because a thing is difficult for you, do not therefore suppose it to be beyond mortal power. On the contrary, if anything is possible and proper for man to do, assume that it must fall within your own capacity.

How ridiculous not to flee from one's own wickedness, which is possible, yet endeavor to flee from another's which is not.