In baptism, God's saving grace, His very presence, enters into the human soul. The essential rite of baptism is very simple. The person celebrating the sacrament (usually a priest) says 'I baptize you in the Name of the Father, and of the Son, and of the Holy Spirit' while pouring water over the head of the person receiving the sacrament or dipping the person in water. For Catholics, baptism is the sacrament of salvation and the door to all other sacraments.