The greatest commandment of all is this: Love the Lord your God with all your heart, soul, mind and strength. We must supremely love Him. We must love Him with all our powers in very deed; nothing short of this could satisfy God. This is the nature of our love to Christ: it must be sincere, with all the heart. It must be intelligent, with all the mind. It is also emotional, with all the soul. And, intense and energetic, with all the strength.
Observe that love is not merely one way of fulfilling the Law. It is the best way. Far better to love man so much that to steal from him would be impossible. Love is the most important thing. And, love to God will produce obedience, voluntary, cheerful obedience. That is why loving God above all else will produce great and fulfilling results.
Your love to God will moderate your affections towards worldly enjoyments, which are apt to take up too much room in our hearts, and to engross unlawful degrees of our love. It will qualify you for dutiful submission to God under temporal evils, and bodily afflictions, and prevent complaints against God. Love to God will prepare you for communion with God, manifestations of Himself to you. It fits the soul for delightful meditation upon God. So, You must love him with all your heart, soul, mind, and strength.