“You see, the way I look at it, if you halt your forward progress every time you get a little tired or irritable or whatever, then you are suffering from a lack of discipline. On the other hand, if you keep pushing when you are chronically tired or really sick, then you are a fool. A lot of men do this because of a misplaced sense of macho. It’s not macho, it’s stupid.”
—The Boron Letters; Gary C. Halbert












