1. Be interested in your subject. 2. Know your subject. 3. Know about the ways of learning: the best way to learn anything is to discover it yourself. 4. Try to read the faces of your students, try to see their expectations and difficulties, put yourself in their place. 5. Give them not only information, but "know-how", attitude of mind, the habit of methodical work. 6. Let them learn guessing; this does not mean wild guessing but "educated reasonable" guessing. 7. Let them learn proving. 8. Look out for such features of the problem at hand as may be useful in solving the problems to come. 9. Do not give away your whole secret at once. 10. Suggest it, do not force it down their throats.