Effectiveness in teaching the Bible is purchased at the price of much study, some of it lonely, all of it tiring.
The broader problem is that a great deal of popular preaching and teaching uses the bible as a pegboard on which to hang a fair bit of Christianized pop psychology or moralizing encouragement, with very little effort to teach the faithful, from the Bible, the massive doctrines of historic confessional Christianity.
There is no long-range effective teaching of the Bible that is not accompanied by long hours of ongoing study of the Bible.
For the far higher task of teaching fortitude and patience I was never fool enough to suppose myself qualified, nor have I anything to offer my readers except my conviction that when pain is to be borne, a little courage helps more than much knowledge, a little human sympathy more than much courage, and the least tincture of the love of God more than all.