If life were nothing but an unending challenge, where every action had to challenge the actor to their full potential, I think it would be hard to tolerate.

What's the point of working hard to make the world better, if the only thing you're working hard for is to enable more hard work?

I want my children to work hard, to challenge themselves, and to do something valuable. I also want them to have a good time, and not become worker robots.

There's a place for everything. Retirement is the place for entertaining your own hobbies and interests, even if that means working on your boat and going out on the lake.