Epictetus, Golden Sayings 40

Epaphroditus had a shoemaker as a slave, whom he sold as being a good-for-nothing. This fellow, by some accident, was afterwards purchased by one of Caesar's men, and became a shoemaker to Caesar. You should have seen what respect Epaphroditus paid him then. "How is the good Felicion? Kindly let me know!" 

And if any of us inquired, "What is Epaphroditus doing?" the answer was, "He is consulting about so and so with Felicion."

Had he not sold him as a good-for-nothing? Who had in suddenly converted him into a know-it-all? 

This is what comes of holding of importance anything but the things that depend on the Will.