Nowhere can man find a quieter or more untroubled retreat than in his own soul.

Observe always that everything is the result of a change, and get used to thinking that there is nothing Nature loves so well as to change existing forms and to make new ones like them.

Observe the movements of the stars as if you were running their courses with them, and let your mind constantly dwell on the changes of the elements into each other. Such imaginings wash away the filth of life on the ground.

Waste no more time arguing what a good man should be. Be one.

Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life.

From Apollonius I learned freedom of will and undeviating steadiness of purpose; and to look to nothing else, not even for a moment, except to reason.

...small too even the longest fame thereafter, which is itself subject to a succession of little men who quickly die, and have no knowledge of themselves, let alone of those long dead.