21. Every arrangement of the societies in that world, is an arrangement according to the differences of love; the reason of which is, that love is the life of man, and the Lord, who is Divine love itself, arranges them according to its reception; and the differences of loves are innumerable, which no one knows but the Lord alone. He so conjoins the societies, that they all lead as it were one life of man; the societies of the heavens one life of celestial and spiritual love; the societies of the hells, one life of diabolical and infernal love; He conjoins the heavens and the hells by oppositions. Because there is such an arrangement, every man after death goes into the society of his own love, nor can he go into any other, for his love opposes it. Hence it is that they who are in spiritual love are in heaven, but they who are in natural love only, are in hell. Spiritual love is implanted solely by the life of charity, and natural love remains natural, if the life of charity is omitted; and natural love, if it is not subjected to spiritual love, is opposed to it.