Comment by roenxi

There are a lot of people who more discipline would help, but in many cases it seems to me that they just don't know what to do. For example, if someone lying there dying has a regret like "I wish I hadn't worked so hard" or "I wish I had let myself be happier" it is hard to say that their #1 problem is that they lacked discipline. I know a couple of people who are extremely disciplined ... at making themselves unhappy for no good reason.

I think it is more likely that a lot of people either didn't know how to relax - or potentially have internalised something about the nature of happiness that isn't true and that they can't let go of.