Baptism is the sign of new life through Jesus Christ. It unites the one baptized with Christ and with his people. The New Testament scriptures and the liturgy of the Church unfold the meaning of baptism in various images which express the riches of Christ and the gifts of his salvation. These images are sometimes linked with the symbolic uses of water in the Old Testament. Baptism is participation in Christ's death and resurrection (Rom. 6:3-5; Col. 2:12); a washing away of sin (1 Cor. 6:11); a new birth (John 3:5); an enlightenment by Christ (Eph. 5:14); a reclothing in Christ (Gal. 3:27); a renewal by the Spirit (Titus 3:5); the experience of salvation from the flood (1 Peter 3:20-21); an exodus from bondage (1 Cor. 10:1-2) and a liberation into a new humanity in which barriers of division whether of sex or race or social status are transcended (Gal. 3:27-28; 1 Cor. 12:13). The images are many but the reality is one.
Baptism means participating in the life, death and resurrection of Jesus Christ. Jesus went down into the river Jordan and was baptized in solidarity with sinners fulfill all righteousness (Matt. 3:15). This baptism led Jesus along the way of the Suffering Servant, made manifest in his sufferings, death and resurrection (Mark 10:38-40, 45). By baptism, Christians are immersed in the liberating death of Christ where their sins are buried, where the "old Adam" is crucified with Christ, and where the power of sin is broken. Thus those baptized are no longer slaves to sin, but free. Fully identified with the death of Christ, they are buried with him and are raised here and now to a new life in the power of the resurrection of Jesus Christ, confident that they will also ultimately be one with him in a resurrection like his (Rom. 6:3-11; Col. 2:13, 3:1; Eph. 2:5-6).
The baptism which makes Christians partakers of the mystery of Christ's death and resurrection implies confession of sin and conversion of heart. The baptism administered by John was itself a baptism of repentance for the forgiveness of sins (Mark 1:4). The New Testament underlines the ethical implications of baptism by representing it as an ablution which washes the body with pure water, a cleansing of the heart of all sin, and an act of justification (Heb 10:22; 1 Peter 3:21; Acts 22:16; 1 Cor. 6:11). Thus those baptized are pardoned, cleansed and sanctified by Christ, and are given as part of their baptismal experience a new ethical orientation under the guidance of the Holy Spirit.
The Holy Spirit is at work in the lives of people before, in and after their baptism. It is the same Spirit who revealed Jesus as the Son (Mark 1:10-11) and who empowered and united the disciples at Pentecost (Acts 2). God bestows upon all baptized persons the anointing and the promise of the Holy Spirit, marks them with a seal and implants in their hearts the first installment of their inheritance as sons and daughters of God. The Holy Spirit nurtures the life of faith in their hearts until the final deliverance when they will enter into its full possession, to the praise of the glory of God (II Cor. 1:21-22; Eph. 1:13-14).
Administered in obedience to our Lord, baptism is a sign and seal of our common discipleship. Through baptism, Christians are brought into union with Christ, with each other and with the Church of every time and place. Our common baptism, which unites us to Christ in faith, is thus a basic bond of unity. We are one people and are called to confess and serve one Lord in each place and in all the world. The union with Christ which we share through baptism has important implications for Christian unity. "There is... one baptism, one God and Father of us all... (Eph. 4:4-6). When baptismal unity is realized in one holy, catholic, apostolic Church, a genuine Christian witness can be made to the healing and reconciling love of God. Therefore, our one baptism into Christ constitutes a call to the churches to overcome their divisions and visibly manifest their fellowship.
Baptism initiates the reality of the new life given in the midst of the present world. It gives participation in the community of the Holy Spirit. It is a sign of the Kingdom of God and of the life of the world to come. Through the gifts of faith, hope and love, baptism has a dynamic which embraces the whole of life, extends to all nations, and anticipates the day when every tongue will confess that Jesus Christ is Lord to the glory of God the Father.