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In general, any methods of discipline applied to the body which tend to modify its desires or repulsions, are good--for ascetic ends.
But if done for 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!"