Bhagavad Gita, Chapter 3, Verse 42

The senses, it is said, are great; greater than the senses is the mind; greater than the mind is the understanding; and greater still than the understanding is the Self.

There's a ladder here: senses, mind, intellect, self. Each is meant to be guided by the one above it.

Krishna lays out a chain, body, senses, mind, intellect, soul, each one able to govern what's beneath it. Knowing that order is what makes the next verse's instruction make sense.