Discourses, "About Cynicism" (§4)

“It is his duty then to be able with a loud voice, if the occasion should arise, and appearing on the tragic stage to say like Socrates: Men, whither are you hurrying, what are you doing, wretches? like blind people you are wandering up and down; you are going by another road, and have left the true road; you seek for prosperity and happiness where they are not, and if another shows you where they are, you do not believe him.”