The Encheiridion, or Manual (6-10)

Be not elated at any advantage (excellence), which belongs to another. If a horse when he is elated should

As on a voyage when the vessel has reached a port, if you go out to get water, it is an amusement by the way to pick up a shell fish or some bulb, but your thoughts ought to be directed to the ship, and you ought to be constantly watching if the captain should call, and then you must throw away all those things, that you may not be bound and pitched into the ship like sheep: so in life also, if there be given to you instead of a little bulb and a shell a wife and child, there will be nothing to prevent (you from taking them). But if the captain should call, run to the ship, and leave all those things without regard to them. But if you are old, do not even go far from the ship, lest when you are called you make default.

Seek not that the things which happen[*] should happen as you wish; but wish the things which happen to be as they are, and you will have a tranquil flow of life.

Disease is an impediment to the body, but not to the will, unless the will itself chooses. Lameness is an impediment to the leg, but not to the will. And add this. reflection on the occasion of every thing that happens; for you will find it an impediment to something else, but not to yourself.

On the occasion of every accident (event) that befals you, remember to turn to yourself and inquire what power you have for turning it to use. If you see a fair man or a fair woman, you will find that the power to resist is temperance (continence). If labour (pain) be presented to you, you will find that it is endurance. If it be abusive words, you will find it to be patience. And if you have been thus formed to the (proper) habit, the appearances will not carry you along with them.