Mystici Corporis Christi §63

⁶³ Hence, this word in its correct signification gives us to understand that the Church, a perfect society of its kind, is not made up of merely moral and juridical elements and principles. It is far superior to all other human societies; it surpasses them as grace surpasses nature, as things immortal are above all those that perish. Such human societies, and in the first place civil Society, are by no means to be despised or belittled; but the Church in its entirety is not found within this natural order, any more than the whole man is encompassed within the organism of our mortal body. Although the juridical principles, on which the Church rests and is established, derive from the divine constitution given to it by Christ and contribute to the attaining of its supernatural end, nevertheless that which lifts the Society of Christians far above the whole natural order is the Spirit of our Redeemer who penetrates and fills every part of the Church's being and is active within it until the end of time as the source of every grace and every gift and every miraculous power. Just as our composite mortal body, although it is a marvelous work of the Creator, falls far short of the eminent dignity of our soul, so the social structure of the Christian community, though it proclaims the wisdom of its divine Architect, still remains something inferior when compared to the spiritual gifts which give it beauty and life, and to the divine source whence they flow.