Status Updates From Epictetus' Handbook and the...

And when someone says to you that you know nothing, and you are not offended, then know that you have begun your work. For sheep do not show the shepherd how much they have eaten by vomiting up their fodder, but they digest their food within to produce wool and milk on the outside.

In the final sentence of Handbook 2.2, Epictetus urges his students to make use of their faculty of impulse - and its opposite, repulsion - but lightly and without straining, which means not taking the successful outcome of any action as really important, and not attaching their emotional well-being to what actually happens, one way or the other.