What became visible only after your working life slowed down or ended?

I'm the only president that's ever visited Africa south of the Sahara Desert. I went to two (African) countries while I was president, and I didn't know the potential of that continent, nor the challenges that faced those people. Now I do. To a much greater extent I didn't understand the [widespread] problems in our own country, from a personal point of view. I was dealing with billions of dollars that would be allocated for education or health or welfare or housing, or whatever. But I didn't know from a personal point of view the people that actually were in need or that were the recipients of those quite often inadequate and ill-designed programs.

The day I retired from teaching, again, was one of the most satisfying days of my life and it was sad, but when I — the day I retired, I went home and I was by myself and I was having a glass of wine. I was thinking about the lunch the teachers gave me that day. The retirement lunch. And I was able to look back on that life, that 30 years in the classroom, and say — I was able to congratulate myself. I'm glad I did that. That was good. I felt useful, that I don't think I would have felt if I had gone into business or something like that.