When you have learned to nourish your body frugally, do not pique
yourself upon it; nor, if you drink water, be saying upon every occasion,
“I drink water.” But first consider how much more frugal are the poor
than we, and how much more patient of hardship. If at any time you would
inure yourself by exercise to labor and privation, for your own sake and
not for the public, do not attempt great feats; but when you are
violently thirsty, just rinse your mouth with water, and tell nobody.