It is the sign of a dull mind to dwell upon the cares of the body, to prolong exercise, eating and drinking and other bodily functions. These things are best done by the way; all your attention must be given to the mind.

Within our control are our own opinions, aspirations, and desires and the demons that distract us from these goals. Outside of our control are such things as what kind of body we have, whether or not we are born into wealth, and how we are regarded by others.

He who exercises wisdom exercises the knowledge which is about God.

No great thing is created suddenly.

Anything worth putting off is worth abandoning altogether.

The cause of all human evils is the not being able to apply general principles to special cases.

Opportunity beckons more surely when misfortune comes upon a person than it ever does when that person is riding the crest of a wave of success. It sharpens a person's wits, if that person will let it, enabling him or her to see more clearly and evaluate situations with a more knowledgeable judgment.