Tonight was Ash Wednesday, and part of the message asked about the discipline of denying ourselves things that aren't good for us, now that we can have everything.
Yes. One learns one kind of discipline by enduring being deprived of things by circumstances or others. That has been most of human history, of making our way when we can't have what we want. It is a different type of discipline to deny ourselves something because it is not good for us, or even just to practice not having things. Few practice fasting anymore. I keep meaning to, but only manage it irregularly. Not disciplined enough, clearly.