This implies that the teacher has a very great responsibility. He must mobilize all his personal power, love, insight, and understanding. The most clever gimmicks will not achieve anything of lasting value. Unless there is an inner engagement, an attachment, a personal appreciation of the subject matter, the ﬁnest instructor will become inelfective.—Abraham Joshua Heschel in Moral Grandeur and Spiritual Audacity: Essays, 152
That is so true. Think back about the best teachers you have had. Their techniques were varied, but what didn't vary was their love and appreciation for the subject matter they were teaching. They weren't so much teaching, as giving you a glimpse of what motivated and inspired them. You can't help but be motivated by that kind of fire. How much moreso when what they are teaching is the love of God!