Ken Bain said this quote

To benefit from what the best teachers do, however, we must embrace a different model, one in which teaching occurs only when learning takes place. Most fundamentally, teaching in this conception is creating those conditions in which most--if not all--of our students will realize their potential to learn. That sounds like hard work, and it is a little scary because we don't have complete control over who we are, but it is highly rewarding and obtainable.