Read Matthew 22:34-40.

"Jesus said unto him, Thou shalt love the LORD thy God with all thy heart, and with all thy soul, and with all thy mind" (v. 37).

Man was made to love God. Instead, we are twisted by the selfishness of sin to love ourselves. Love degenerated from a principle of life to a passion. Love as a primary word in defining/describing Christianity goes beyond an emotion that may change with circumstances. It is a purposeful seeking the best interest of another. It is the conquering of all contrary dispositions involving the total person. Emotion may at times accompany the purpose of the heart but it is not the primary distinguishing characteristic. We do not “fall in love” with God, but we set our hearts to love him through an exercise of the will. It is the greatest commandment because we are the most like God and his love for us in fulfilling it. It is the greatest commandment because it demands the mind and the will. This resolve to love positions us to love him more as we know Him because it provides the moral foundation that supports greater love. It is well to remember that the giving and repeating of this commandment precedes both Calvary and Pentecost. With Calvary in view and Pentecost empowering, fulfilling this greatest commandment should be within the reach of all who purpose to find its realization in their lives. (William E. Snider)

“Christian love is not merely an emotional experience
which comes unbidden and unsought;
it is a deliberate principle of the mind and
a deliberate conquest and achievement of the will.”
— William Barclay