If you take a captured wife MUST you have a rebellious child (ben sorah umorah)? 

(Not a great reward for fulfilling the mitzvah. )

Topics: Do not underestimate yourself! (Dovid did!) We can overcome. Do not fool ourselves. Part of our repentance is underestimating ourselves. Yetzer hara is a mountain before the sin and a strand of hair after. We create our rebellious child. Hashem is within us before we sin and we can overcome.