The Golden Sayings of Epictetus by Epictitus Part 10 Page 11

display, they betray at once a man who keeps an eye on outward show; who has an ulterior purpose, and is looking for spectators to shout, “Oh what a great man!” This is why Apollonius so well said: “If you are bent upon a little private discipline, wait till you are choking with heat some day — then take a mouthful of cold water, and spit it out again, and tell no man!”