Enchiridion 8

Do not seek to have everything that happens happen as you wish, but wish for everything to happen as it actually does happen, and your life will be serene.

Epictetus, Enchiridion 8, translated by W. A. Oldfather

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.

Epictetus, Enchiridion 8, translated by George Long

Ask not that events should happen as you will, but let your will be that events should happen as they do, and you shall have peace.

Epictetus, Enchiridion 8, translated by P. E. Matheson