35 All of us realize that there is more than one way in which Christ is present in His Church. We want to go into this very joyful subject, which the Constitution on the Sacred Liturgy presented briefly, (30) at somewhat greater length. Christ is present in His Church when she prays, since He is the one who "prays for us and prays in us and to whom we pray: He prays for us as our priest, He prays in us as our head, He is prayed to by us as our God" (31); and He is the one who has promised, "Where two or three are gathered together in my name, I am there in the midst of them." (32) He is present in the Church as she performs her works of mercy, not just because whatever good we do to one of His least brethren we do to Christ Himself, (33)but also because Christ is the one who performs these works through the Church and who continually helps men with His divine love. He is present in the Church as she moves along on her pilgrimage with a longing to reach the portals of eternal life, for He is the one who dwells in our hearts through faith, (34) and who instills charity in them through the Holy Spirit whom He gives to us. (35)
Source: Mysterium Fidei (Vatican.va)