Reflection Starter from the Second Vatican Council

"Having accomplished the work that the Father had entrusted to the Son on earth (cf. Jn 17:4), on the day of Pentecost the Holy Spirit was sent to sanctify the Church forever, so that believers might have access to the Father through Christ in one Spirit (cf. Eph 2:18). He is the Spirit of life, the fountain of water springing up to eternal life (cf. Jn 4:14; 7:38ff.), the One through whom the Father restores life to those who are dead through sin, until one day he will raise in Christ their mortal bodies" (cf. Rom 8:10f.). - Second Vatican Council, Dogmatic Constitution on the Church, Lumen Gentium