Bhagavad Gita, Chapter 3, Verse 40

The senses, the mind, and the understanding are said to be its seat. Through these it deludes the embodied self, veiling knowledge.

This is exactly where the real work needs to happen, right at the senses, the mind, and the intellect.

Krishna gets specific here about where desire actually operates, not somewhere vague, but through the very faculties meant to help someone see clearly. Once those get compromised, sound judgment doesn't stand much of a chance.