Chapter 28 presents a summary of Reformed baptismal theology. Baptism joins a person to the visible church and signifies the person's union with Christ, regeneration, forgiveness of sin and newness of life. Individuals should be baptized in water using the Trinitarian formula ("in the name of the Father, and of the Son, and of the Holy Ghost"). Baptism by immersion is not necessary; affusion and aspersion are acceptable modes. The confession approves of infant baptism if one or both parents are Christians. While it teaches that neglecting baptism is a "great sin", the confession does not endorse baptismal regeneration. It states that it is possible to be regenerated without baptism, and unregenerated with baptism. This is because the effectiveness of baptism is not tied to the moment in time it is administered; the grace promised is granted by the Holy Spirit to the elect according to God's own will and at the time of his choosing. According to the confession, baptism is to be received only once.