Bhagavad Gita, Chapter 4, Verse 27

Some again offer all the actions of the senses and the functions of the vital energy, as sacrifice in the fire of control in self, kindled by knowledge.

For some people, real understanding itself becomes the thing that quiets the senses down, not willpower alone.

This describes a path led primarily by insight rather than raw discipline. Seeing clearly enough what's actually going on underneath sensory experience is what allows the mind to settle, more than forcing it to.