I'm not a big fan of flying. I definitely try to take the bus whenever I can. I've gotten a little bit better about it, but it was a pretty crippling thing for many years. I feel safer in a private plane.
Self-discipline is an act of cultivation. It require you to connect today's actions to tomorrow's results. There's a season for sowing a season for reaping. Self-discipline helps you know which is which.
I can be pretty nasty. Not 'mean' nasty, but nasty by your parents' standards. But not by my parents' standards, because my parents were nasty for their day.