The flesh warring against the Spirit is a real thing and it is the reason why many times we don't see victory in our life. God's Spirit is pure and holy. Ours comes from a broken, sin-filled world.
Flesh vs. Spirit
Transformation
Renewing our mind according to Scripture brings about transformation in our life. It brings life in a way that nothing else can do. Even when we have been beat down by the enemy, God is more powerful, and His Word is a two-edged sword the enemy cannot defeat.