STOP AND THINK – To teach is to learn twice. (Joseph Joubert, 18-19th century French essayist)
Everyone who has ever attempted to teach a subject that he or she is not thoroughly familiar with has discovered the truth of this statement. Not only do we learn by doing, we learn also by teaching. To prepare carefully to teach is to guarantee that at least the teacher will learn. And the students will very likely learn as well.
In everything set them an example by doing what is good. In your teaching show integrity, seriousness. (Titus 2:7)