“Discipline is doing what you don't want to do so you can do what you want to do.”
“There are days when you don't feel like running. Those are the days you have to do it. Discipline is doing what you don't want to do so you can do what you really want to do. Got that?”
“Don't do what you want. Do what you don't want. Do what you're trained not to want. Do the things that scare you the most.”
“Freedom begins way back. It begins not with doing what you want but with doing what you ought - that is, with discipline.”
“do what you got to do now, so you can do what you want to do later”
“Do what you have to do so that you can be what you want to be”