Here is what you can understand. Advice is just advice and can be unsolicited. Good teachers point they way, and not convince. They are a tour guide that let you learn for your self rather than offering up advice. They can show you and lead by example, and let you think for yourself. They can point to results and new ways of thinking with out coming across as unsolicited advice. They can awaken you to new ideas without coming across like a pushy or preachy person. They have a hands off policy and let you earn things for yourself.