Bhagavad Gita, Chapter 3, Verse 43

Thus knowing that which is higher than the understanding, and steadying the self by the Self, O you of mighty arms, destroy this hard-to-conquer enemy in the form of desire.

Let the deepest part of who you are be the one actually steering, and this whole struggle finally has real leverage.

This closes the chapter by pulling everything together: the soul was always meant to be in charge, not the senses or the racing mind. Once that true order gets restored, even something as persistent as unchecked desire finally has something strong enough to answer to.