EPICTETUS. DISCOURSES. Book ii. §24. ¶2.
THE school of a philosopher is a surgery. You are not to go out of it with pleasure, but with pain: for you come there not in health; but one of you had a dislocated shoulder, another an abscess, a third a fistula, a fourth the headache. And am I, then, to sit uttering pretty trifling thoughts and little exclamations that, when you have praised me, you may each of you go away with the same dislocated shoulder, the same aching head, the same fistula, and the same abscess that you brought? And is it for this that young men are to travel? And do they leave their parents, their friends, their relations, and their estates that they may praise you while you are uttering little exclamations?