The passage of time is a continuing thing. At 18, you're going to live forever, and you are definitely not at 52, so that is a recurring topic. I still think it's the main stuff.
“When I'm sitting in the church alone, I can hear singing of the old people. I can hear their singing and I can hear their praying, and sometimes I hum one of their songs.”
“We in universities are not in the democracy business. What we do, when we're doing it, is teach and learn.”