I think about David Livingstone when he climbed into the pulpit of a little church in Scotland. He'd honed his sermon. He'd prepared it so very well. He wanted to be a great preacher. He wanted to go give his life on the mission field. And when he got up to preach that night, he flapped his wings, but he couldn't get off the runway. He tried, but finally he forgot his sermon altogether; so he apologized to the people and left in great shame.

But Robert Moffat, the famous missionary, was there. And Moffat came up to him after the service and said, "You can be a great and wonderful servant of God. Why don't you go to medical school?" Today you can't mention Africa without thinking about David Livingstone. But what would have happened to David Livingstone without Robert Moffat?