The same reason makes a man a religious enthusiast, that makes a man an enthusiast in any other way - an uncomfortable mind in an uncomfortable body. [ Hazlitt ]

People who are jealous, or particularly careful of their own rights and dignity, always find enough of those who do not care for either to keep them continually uncomfortable. [ Barnes ]

In the matter of diet - which is another main thing - I have been persistently strict in sticking to the things which didn't agree with me until one or the other of us got the best of it. Until lately I got the best of it myself. But last spring I stopped frolicking with mince-pie after midnight; up to then I had always believed it wasn't loaded. For thirty years I have taken coffee and bread at eight in the morning, and no bite nor sup until seven-thirty in the evening. Eleven hours. That is all right for me, and is wholesome, because I have never had a headache in my life, but headachy people would not reach seventy comfortably by that road, and they would be foolish to try it. And I wish to urge upon you this - which I think is wisdom - that if you find you can't make seventy by any but an uncomfortable road, don't you go. When they take off the Pullman and retire you to the rancid smoker, put on your things, count your checks, and get out at the first way station where there's a cemetery. [ Mark Twain, Seventieth Birthday speech ]