Bro. James explains how God desires for us to consecrate our whole heart, our whole life, to Him. That's why He gave His all, including His Son, to make it possible for us to love Him. "Since Jesus gave His life for me, should I not give Him mine?" The heart is where the affection is. Once our heart is consecrated and sanctified, God can lead us onto perfection. 

Scriptures referenced include Exodus 32:29, Proverbs 23:26, I Thess 5:23, Romans 12:1, Hebrews 6:1; Romans 5:1