In my opinion the following sentence is no small thought. Sins power comes from the illusion that makes us think that God is separated from us. Living in that untruth (separateness) causes us to do all sorts of stupid things. The Cross was the ultimate demonstration of His love for all of us. God does not separate Himself from us because of sin, we separate our selves from him (or at least we think we do) because we think we are not worthy to be in His presence. We suffer from shame. Once we realize that He always, always loves us and we can live in His affection and then seek Him, well that is what repentance is, we changed our mind about how much God loves us.