Mr. Siegenthaler is like a really great coach - always reinforcing and emphasizing mastery of the basic knowledge and skills that are necessary to achieve top performance. And like a really great teacher, he never confuses, never over-complicates. If you didn't quite get what he just said, don't just brush it off. Listen to it again. Or read it again. Don't give up. Listen and read carefully. Sometimes you have to work hard to be able to understand something. When you really understand something, that becomes a powerful tool in your hands.