This is the very thing which makes up the virtue of the happy person and a well—flowing life — when the affairs of life are in every way turned to the harmony between the individual divine spirit and the will of the director of the universe.

— Chrysippus, Quoted in Diogenes Laertius, Lives of the Eminent Philosophers, 7.1.88 (resource) Ryan Holiday, The 366 Meditations on Wisdom, Perseverance, and the Art of Living