EPICTETUS. DISCOURSES. Book ii. §12. ¶1.
"CAN you show us, then, in what manner you have taken care of this soul? For it is not probable that a person of your wisdom, and approved character in the State, should carelessly suffer the most excellent thing that belongs to you to be neglected and lost." — "No, certainly." "But do you take care of it yourself? And is it by the instructions of another, or by your own discovery how it ought to be done?" Here now comes the danger, that he may first say. "Pray, good sir, what business is that of yours? What are you to me?" Then, if you persist to trouble him, he may lift up his hand and give you a box on the ear. I myself was once a great admirer of this method of instruction, till I fell into such kind of adventures.