One day C.S. Lewis was sitting in his office in the English department when a friend, who was an unbeliever, wandered in. There were carolers below in the courtyard singing Christmas carols and as the two were speaking, they could hear them singing a Christmas carol that contained words about Jesus’ virgin birth.

His unbelieving friend said to C. S. Lewis, “Isn’t it good that we now know better than they did?” C. S. Lewis said, “What do you mean?” “Well, isn’t it good that we now know more than they did?” “I am afraid that you will have to explain,” Lewis said. “Well, isn’t it good that we now know that virgins don’t have babies?” C.S. Lewis looked at him incredulously and said, “Don’t you think that they knew that? That is the whole point.” Virgins don’t have babies.