You could say that the life work of English politician William Wilberforce was gradually eliminating slavery through 69 initiatives he piloted that changed his nation—and the world. However, after he came to faith in Christ at age 26, he almost quit politics to go into the "ministry" because he thought it to be a "higher" calling. Fortunately for us, a converted former slave trader named John Newton (the writer of "Amazing Grace") challenged the young man to stay where God could use him most—in politics.