Redemptoris Missio §47

⁴⁷ The apostles, prompted by the Spirit, invited all to change their lives, to be converted and to be baptized. Immediately after the event of Pentecost, Peter spoke convincingly to the crowd: "When they heard this, they were cut to the heart, and said to Peter and the rest of the Apostles, 'Brethren, what shall we do?' And Peter said to them, ' Repent , and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins; and you shall receive the gift of the Holy Spirit'" (Acts 2:37-38). That very day some three thousand persons were baptized. And again, after the healing of the lame man, Peter spoke to the crowd and repeated: "Repent therefore, and turn again, that your sins may be blotted out!" (Acts 3:19) Conversion to Christ is joined to Baptism not only because of the Church's practice, but also by the will of Christ himself, who sent the apostles to make disciples of all nations and to baptize them (cf. Mt 28:19). Conversion is also joined to Baptism because of the intrinsic need to receive the fullness of new life in Christ. As Jesus says to Nicodemus: "Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God" (Jn 3:5). In Baptism, in fact, we are born anew to the life of God's children, united to Jesus Christ and anointed in the Holy Spirit. Baptism is not simply a seal of conversion, and a kind of external sign indicating conversion and attesting to it. Rather, it is the sacrament which signifies and effects rebirth from the Spirit, establishes real and unbreakable bonds with the Blessed Trinity, and makes us members of the Body of Christ, which is the Church. All this needs to be said, since not a few people, precisely in those areas involved in the mission ad gentes , tend to separate conversion to Christ from Baptism, regarding Baptism as unnecessary. It is true that in some places sociological considerations associated with Baptism obscure its genuine meaning as an act of faith. This is due to a variety of historical and cultural factors which must be removed where they still exist, so that the sacrament of spiritual rebirth can be seen for what it truly is. Local ecclesial communities must devote themselves to this task. It is also true that many profess an interior commitment to Christ and his message yet do not wish to be committed sacramentally, since, owing to prejudice or because of the failings of Christians, they find it difficult to grasp the true nature of the Church as a mystery of faith and love. I wish to encourage such people to be fully open to Christ, and to remind them that, if they feel drawn to Christ, it was he himself who desired that the Church should be the "place" where they would in fact find him. At the same time, I invite the Christian faithful, both individually and as communities, to bear authentic witness to Christ through the new life they have received. Certainly, every convert is a gift to the Church and represents a serious responsibility for her, not only because converts have to be prepared for Baptism through the catechumenate and then be guided by religious instruction, but also because - especially in the case of adults-such converts bring with them a kind of new energy, an enthusiasm for the faith, and a desire to see the Gospel lived out in the Church. They would be greatly disappointed if, having entered the ecclesial community, they were to find a life lacking fervor and without signs of renewal! We cannot preach conversion unless we ourselves are converted anew every day.