If you want to work on desire, you have to fundamentally understand yourself. And to do that you have to understand the way your Creator fashioned you and formed you. The Chovos Halevavos in Sha'ar Avodas Elokim explains that when Hashem made the human He took two diverse parts and put them together. There is a half of me that is a cheilek Elokah mi'ma'al (a piece of Hashem), a pure neshamah (soul) that came from under the kisei hakavod (Hashem's throne). And that part of me only wants to do what's good, what's right, what's noble and proper. That's my pure, holy neshamah.