The word "serve" here means "devotion". God demands full devotion to Him. Your spirit, soul, and body devoted to God. Jesus Christ said what shall it profit a man to gain the world and lose your soul. When you are given the opportunity, choose to serve God and God alone! Choose TODAY!
If we would only follow Matthew 7:12, Jesus gave us the way to fulfill the law and the prophets. No memorization needed! Do unto others as you want them to do unto you. You want respect, love, a chance, a gift--Do Unto Others! What a better world we would have. Hallelujah!
Our bodies are pre-disposed to various attacks from the devil, but our soul is out of his reach. Only God has access to both the soul and the body. God is the creator of both and has the power to destroy both. Repent and make Jesus your Lord. Obey His commandments, for this is our duty.