On the Love of God by St. Bernard of Clairvaux (abbot, 1090-1153 AD).
"Thus it happens that once God's sweetness has been tasted, it draws us to the pure love of God more than our needs compel us to love him."
"What are the four degrees of love? First, we love ourselves for our own sake; since we are unspiritual and of the flesh we cannot have an interest in anything that does not relate to ourselves. When we begin to see that we cannot subsist by ourselves, we begin to seek God for our own sakes. This is the second degree of love; we love God, but only for our own interests. But if we begin to worship and come to God again and again by meditating, by reading, by prayer, and by obedience, little by little God becomes known to us through experience. We enter into a sweet familiarity with God, and by tasting how sweet the Lord is we pass into the third degree of love so that now we love God, not for our own sake, but for himself. It should be noted that in this third degree we will stand still for a very long time… I am not certain that the fourth degree of love in which we love ourselves only for the sake of God may be perfectly attained in this life. But, when it does happen, we will experience the joy of the Lord and be forgetful of ourselves in a wonderful way…".
"Thus it happens that once God's sweetness has been tasted, it draws us to the pure love of God more than our needs compel us to love him."
"What are the four degrees of love? First, we love ourselves for our own sake; since we are unspiritual and of the flesh we cannot have an interest in anything that does not relate to ourselves. When we begin to see that we cannot subsist by ourselves, we begin to seek God for our own sakes. This is the second degree of love; we love God, but only for our own interests. But if we begin to worship and come to God again and again by meditating, by reading, by prayer, and by obedience, little by little God becomes known to us through experience. We enter into a sweet familiarity with God, and by tasting how sweet the Lord is we pass into the third degree of love so that now we love God, not for our own sake, but for himself. It should be noted that in this third degree we will stand still for a very long time… I am not certain that the fourth degree of love in which we love ourselves only for the sake of God may be perfectly attained in this life. But, when it does happen, we will experience the joy of the Lord and be forgetful of ourselves in a wonderful way…".