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

But then the amazing thing is to look back. It looks like it all was a straight line. You can see the straight line of light and that makes us who we are.

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.

If I were to give advice to young people, high-achieving young people for example, I'd have to say, don't neglect your family. Politics is important, sitting at the head table is glamorous. Traveling around the world, trying to do something for world peace was wonderful. But family and friends and faith are what really matter in life. And I know that. I see it so clearly now.

So when I leave the court, I'm going to have more than enough to do, just to carry on, maybe telling something of our journey to people who didn't go through that. And also reflecting on our successes on the court, which have been enormous, but also accepting the criticisms of our failures.