Chapter 46, 48-9. Love for G-d out of gratitude. He has favored us not because of our own worthiness (at all). The less deserving we are the more we should feel indebted to Him.
Note: Lessons 42-6 (chapters 46-50) deal with love a gratitude, Kamayim HaPanim LiPanim. Ch. 50 addresses Love from strength. MP3
