If we wish to be good teachers, we must study, and try to understand the things we expect to teach. If a young man wishes to be a minister, he must go through college; and then spend three years in the Divinity School, so that he may understand the great truths of the Bible, which he is to teach the people who hear him. But Jesus never went to college, or to a divinity school. And yet he had greater knowledge about all the things of which he spoke than any other teacher ever had. We are told in the book of Job that "He is _perfect_ in knowledge." Job xxxvi: 5. And the apostle Paul tells us that "in him are hid _all the treasures of wisdom and knowledge_." Col. ii: 3. This is more than can be said of any man, or any angel. If we could take all the knowledge of all the best teachers who ever lived, and give it to one person, it would be as nothing compared to the knowledge which Jesus, "the Great Teacher" had. He knew all about heaven; for that had always been his home before he came into our world. He knew all about God; for, he was "in the bosom of the Father," John i: 18; and, as he tells us himself, had shared his glory with him, "before the world was." John xvii: 5. He knew all about the world we live in, for he made it. John i: 10. He knew all about all other worlds, for he made them, too. John i: 3; Heb. i: 2. He knew all about his disciples and every body else in the world, for he made them all. He saw all they did; he heard all they said; he knew all they thought, or felt. Wise and learned men have been studying, and finding out things for hundreds of years, about geography and natural history--and astronomy;--about light, and heat, and electricity--and steam--and the telegraph, and many other things. Jesus knew all about these things when he was on earth. He could have told about them, if he had seen fit to do so. But he only told us what it is best for us to know, in order that we might be saved; and kept back all the rest. The things that Jesus did teach us when he was here on earth were wonderful; but it is hardly less wonderful to think of the things that he might have taught us, and yet did not. When we think of the great knowledge of Jesus, as a Teacher, we are not surprised that some of those who heard him "wondered at the gracious words" he spake; or that others asked the question: "Whence hath this man this knowledge, having never learned?" Some one has written these sweet lines about Christ as--_The Great Teacher_: