I. "The One whom the Father has sent into our hearts, the Spirit of His Son, is truly God. Consubstantial with the Father and the Son, the Spirit is inseparable from them, in both the inner life of the Trinity and His gift of love for the world." Catechism of the Catholic Church 689.

II. "The grace of the Holy Spirit confers upon us the righteousness of God. Uniting us by faith and Baptism to the Passion and Resurrection of Christ, the Spirit makes us sharers in His life." Catechism of the Catholic Church 2017.

III. "What the soul is to the human body, the Holy Spirit is to the Body of Christ, which is the Church. . . . The Holy Spirit makes the Church the temple of the living God." Catechism of the Catholic Church 797.