Love, in the theological sense, is not a feeling or sentiment, though it is often accompanied by those psychological states. In its essence, Love is an act of the will, more precisely, the will of the good of the other. To love is really to want what is good for someone else and then to act on that desire.
Many are kind, generous, or just, but only so that someone else might return the favor and be kind, generous, or just to us. This is indirect egotism rather than love. Real Love is an ecstatic act, a leaping outside of the narrow confines of my needs and desires and an embrace of the other's good for the other's sake.
It is an escape from the black hole of the ego, which tends to draw everything around it into itself. In light of this understanding, we can know see that God's creation of the world is a supreme act of Love.