On the Love of God addresses the reasons we ought to love God and the manner and different degrees of this love. St. Bernard teaches that God Himself is the motive of our love for him and that nothing is more reasonable and nothing more profitable than loving him. He then lays out the degrees whereby the soul proceeds from loving God for its own sake to loving the self only for God.
St. Bernard of Clairvaux was a French abbot and had a hand in the reforming Cistercian order.