Teaching is reminding others that they know just as well as you. You are all learners, doers and teachers.

You teach best what you need to learn.

That is the difference between good teachers and great teachers: good teachers make the best of a pupil's means; great teachers foresee a pupil's ends.

Teaching of others teacheth the teacher

There are three things to remember when teaching: know your stuff; know whom you are stuffing; and then stuff them elegantly

Teaching is the only major occupation of man for which we have not yet developed tools that make an average person capable of competence and performance. In teaching we rely on the "naturals," the ones who somehow know how to teach.