This is from one of the articles linked in the linked source, using a metaphor around the idea I tried to share above. You can "play the game of life as best you can," (which includes hopefully bettering the lives of others in addition to yourself) but just don't let it define you.
"In this case, Epictetus said everybody should play the game of life-that the best play it with "skill, fonn, speed and grace." But like most games, you play it with a ball. Your team devotes all its energies to getting the ball across the line.
But after the game, what do you do with the ball? Nobody much cares. It's not worth anything. The competition, the game, was the thing. You play the game with care, making sure you are never making the external a part of yourself, but merely lavishing your skill in regard to it.
The ball was just "used" to make the game possible, so just roll it under the porch and forget it, let it wait for the next game. Most important of all, just don't covet it, don't seek it, don't set your heart on it. It is this latter route that makes externals dangerous, makes them the route to slavery"