I have always remembered his analogy; I wish I had always lived it. When I taught Relief Society several years ago, I had to go out of town on my week. I called the other teacher and left a message on her machine asking if we could switch weeks. She left a message on mine, saying we could, and that was that. I thought.
Except I returned home to frantic answering machine messages, asking where I was and was I planning on teaching that day. No one showed up.