I had a professor in Seminary who came in and sat with the class as we were settling in the first day. He was a grad student assigned to teach a class on the culture of Christianity, so he looked like the rest of us—and he didn’t sit at the desk where we thought the professor would start out. Suffice it to say, we all said some pretty embarrassing things. We were looking for a professor. But we didn’t know who we were looking for. The same...