We can attack, we can execute and win, we can have victory over our jobs, business, battles of life etc. If you don't dominate yourself you could loose all. A man who can control his temper in the midst of uproar, he can dictate what to think of, he can control his word's, can control his apatite can control his urge and have self discipline. That man is already dominating and having victory over his own self.
If you can take charge of yourself, you can control anything and dominate.