They cannot have true love for one another, because they have no love for God. They do not understand love for enemies and offenders.
Those who live according to the spirit of the world are accustomed to ill will, hatred, enmity, and vengeance.
But true love for others belongs only to those who live according to the Spirit of God. This love is poured into our hearts by the Holy Spirit (Rom 5:5).
True love is a divine property, for the being of God, as the fullness of perfections, is eternal and all-perfect love. God is love.
And everyone who loves is born of God and knows God. Whoever nourishes true love for neighbors in his soul and manifests it by works of love shows through this that he is regenerated by the Spirit of God.
He shows that he is a son of God, has grace-filled life from God, and knows God not only by faith and contemplation, but also by feeling, rejoicing in the gift of grace-filled love.
Love is the most excellent gift of the Spirit of God. It unites man with his neighbors, with God, and with the angels.
Love, as a divine gift reflecting in man the property of divine love and goodness, makes man Godlike.
Holy love even on earth gives man a foretaste of the blessedness of the life to come, in union with God and His saints.