Jesus himself, when he began to teach, was about thirty years old, being the son (as was supposed) of Joseph, the son of Heli,

 John was one of the world's supremely effective preachers. Once Chalmers was congratulated on a sermon. "Yes," he said, "but what did it do?" It is clear that John preached for action and produced it. He did not deal in theological subtleties but in life. 