The law requires works of human achievement; the gospel requires faith in Christ's achievement. The law makes demands and bids us obey; the gospel brings promises and bids us believe.
John StottBaptism with water is the sign and seal of baptism with the Spirit, as much as it is of the forgiveness of sins. Water-baptism is the initiatory Christian rite, because Spirit-baptism is the initiatory Christian experience.
John Stott