People who care about their life try to better themselves.By me, partially inspired by Ayn Rand in We The Living.
It sounds pretty obvious. Here's why it's important:
People often, for a wide variety of reasons, do not give learning their best effort. I knew these people do not care about truth-seeking and creating knowledge as much as Popper or I do. But I hadn't made the connection before that what they don't care about, at root, is their own life, in the way Rand cares about life. Life is not precious to them; they aren't dead set on making the most of it.
When someone is careless and wasteful during their own free time, they are disrespecting their own life. When people decide some of their problems are too hard and permanently give up on solving them, and try to be content settling for less, what they are really giving up on is life.