As I was delving into the book of James yesterday I found this verse in 4:5 - "He yearns jealously over the spirit that he has made to dwell in us."
And because I am a nerd I decided to look it up in French...I like comparing the languages because sometimes you get something you just won't find in English. It says: "Dieu ne tolère aucun rival de l'Esprit qu'il a fait habiter en nous."
Direct translation: "God tolerates no rivals for the Spirit that he has made to dwell in us."
What is there that you let fight for your soul besides God? Because I can tell you that anything that fights against God won't win, because we are a "war already won," (lyrics taken from Starfield's "Revolution").