Soon after I joined a branch Church of Christ, Scientist, my first assignment was to teach in the Sunday School. I thought that would be a wonderful privilege, because I loved children.
The first Sunday came with great expectation and joy, but several teachers stopped me on the way to the class saying "Nobody lasts more than one Sunday in that class." This did not faze me because, I guess, I was proud of being a good disciplinarian. That was a mistake.
That Sunday School session was the most embarrassing experience I have had, and it taught me a big lesson in humility.