Enchiridion 7

Just as on a voyage, when your ship has anchored, if you should go on shore to get fresh water, you may pick up a small shell-fish or little bulb on the way, but you have to keep your attention fixed on the ship, and turn about frequently for fear lest the captain should call; and if he calls, you must give up all these things, if you would escape being thrown on board all tied up like the sheep. So it is also in life: If there be given you, instead of a little bulb and a small shell-fish, a little wife and child, there will be no objection to that; only, if the Captain calls, give up all these things and run to the ship, without even turning around to look back. And if you are an old man, never even get very far away from the ship, for fear that when He calls you may be missing.

Epictetus, Enchiridion 7, translated by W. A. Oldfather

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.

Epictetus, Enchiridion 7, translated by George Long

When you are on a voyage, and your ship is at anchorage, and you disembark to get fresh water, you may pick up a small shellfish or a truffle by the way, but you must keep your attention fixed on the ship, and keep looking towards it constantly, to see if the Helmsman calls you; and if he does, you have to leave everything, or be bundled on board with your legs tied like a sheep. So it is in life. If you have a dear wife or child given you, they are like the shellfish or the truffle, they are very well in their way. Only, if the Helmsman call, run back to your ship, leave all else, and do not look behind you. And if you are old, never go far from the ship, so that when you are called you may not fail to appear.

Epictetus, Enchiridion 7, translated by P. E. Matheson