17 One must not think, however, that this ordered or "organic" structure of the body of the Church contains only hierarchical elements and with them is complete; or, as an opposite opinion holds, that it is composed only of those who enjoy charismatic gifts - though members gifted with miraculous powers will never be lacking in the Church. That those who exercise sacred power in this Body are its chief members must be maintained uncompromisingly. It is through them, by commission of the Divine Redeemer Himself, that Christ's apostolate as Teacher, King and Priest is to endure. At the same time, when the Fathers of the Church sing the praises of this Mystical Body of Christ, with its ministries, its variety of ranks, its officers, it conditions, its orders, its duties, they are thinking not only of those who have received Holy Orders, but of all those too, who, following the evangelical counsels, pass their lives either actively among men, or hidden in the silence of the cloister, or who aim at combining the active and contemplative life according to their Institute; as also of those who, though living in the world, consecrate themselves wholeheartedly to spiritual or corporal works of mercy, and of those in the state of holy matrimony. Indeed, let this be clearly understood, especially in our days, fathers and mothers of families, those who are godparents through Baptism, and in particular those members of the laity who collaborate with the ecclesiastical hierarchy in spreading the Kingdom of the Divine Redeemer occupy an honorable, if often a lowly, place in the Christian community, and even they under the impulse of God and with His help, can reach the heights of supreme holiness, which, Jesus Christ has promised, will never be wanting to the Church.
Source: Mystici Corporis Christi (Vatican.va)