"So what you cover is not what matters, but what you uncover is what matters. And if you can somehow do it so that there are parts of the course that they will remember for the rest of their lives, that’s even more important. If a student comes to my lectures, on rainbows, and haloes, and glories, for the rest of their lives, rainbows will never be the same. And they will always think of me when they see a rainbow. And in fact, sometimes 20 or 30 years after a lecture, they send me still pictures, and they say, “Professor Lewin, I saw a rainbow, and I thought of you and here is a picture.” And the interesting thing is, they sometimes send me a picture which is not even a rainbow, which is a glory; but that doesn’t matter. What it shows is, that I have succeeded in making them love physics. And that is my goal. And that should be the goal of every educator. To make them love physics."

— Walter Lewin, MIT professor