6 By Him the bishops are constituted, and by their ministry are multiplied not only the children, but also the fathers-that is to say, the priests-to rule and feed the Church by that Blood wherewith Christ has redeemed Her. "The Holy Ghost hath placed you bishops to rule the Church of God, which He bath purchased with His own Blood" (Acts xx., 28). And both bishops and priests, by the miraculous gift of the Spirit, have the power of absolving sins, according to those words of Christ to the Apostles: "Receive ye the Holy Ghost; whose sins you shall forgive they are forgiven them, and whose you shall retain they are retained" (John xx., 22, 23). That the Church is a divine institution is most clearly proved by the splendour and glory of those gifts and graces with which she is adorned, and whose author and giver is the Holy Ghost. Let it suffice to state that, as Christ is the Head of the Church, so is the Holy Ghost her soul. "What the soul is in our body, that is the Holy Ghost in Christ's body, the Church" (St. Aug., Serm. 187, de Temp.). This being so, no further and fuller "manifestation and revelation of the Divine Spirit" may be imagined or expected; for that which now takes place in the Church is the most perfect possible, and will last until that day when the Church herself, having passed through her militant career, shall be taken up into the joy of the saints triumphing in heaven.
Source: Divinum Illud Munus (Vatican.va)