Those of our pleasures which come most rarely give the greatest delight. - Epictetus

Consider when, on a voyage, your ship is anchored; if you go on shore to get water you may along the way amuse yourself with picking up a shellfish, or an onion. However, your thoughts and continual attention ought to be bent towards the ship, waiting for the captain to call on board; you must then immediately leave all these things, otherwise you will be thrown into the ship, bound neck and feet like a sheep. So it is with life. If, instead of an onion or a shellfish, you are given a wife or child, that is fine.

At feasts, remember that you are entertaining two guests, body and soul. What you give to the body, you presently lose; what you give to the soul, you keep for ever.

We are at the mercy of whoever wields authority over the things we either desire or detest. If you would be free, then, do not wish to have, or avoid, things that other people control, because then you must serve as their slave.