Epictetus · Fragments
Fragment 19
The same
When men are sick and their physician gives them no advice, they are annoyed, and think that he has given them up. And why should not a man feel that way toward the philosopher, and so conclude that he has given up hope of one's ever coming to a sound state of mind, if he no longer tells one anything that is of any use?
Epictetus, Discourses, Fragment 19, translated by W. A. Oldfather (1925–1928). The Stoic Library.