A quote
You need not suppose that I mean meals like Timon’s, or “paupers’ huts,” or any other device which luxurious millionaires use to beguile the tedium of their lives. Let the pallet be a real one, and the coarse cloak; let the bread be hard and grimy. Endure all this for three or four days at a time, sometimes for more, so that it may be a test of yourself instead of a mere hobby. Then, I assure you, my dear Lucilius, you will leap for joy when filled with a pennyworth of food, and you will understand that a man’s peace of mind does not depend upon Fortune; for, even when angry she grants enough for our needs.
Seneca·Letter 18 — On Festivals and Fasting (§7)·trans. Gummere