The baptized person is saved from a corrupt generation, set apart from the world (Acts 2:40-41), made into a disciple of Jesus (Matt. 28:19; John 4:1), incorporated into his church (1 Cor. 12:13), and hence obligated to live a blameless life (Gen. 17:1) in newness of life (Rom. 6), to confess God's name and to keep his commandments (Matt. 28:19). All these benefits have already been bestowed on the baptized person before baptism in the word of the gospel. They were received on the part of the baptized by faith; but now these benefits are further signified and sealed to them in baptism. Hence the situation must not be pictured as one in which before baptism only a few and in any case not all of these benefits were granted in faith and that the one(s) still lacking are now bestowed in baptism. For the Word contains all the promises, and faith accepts them all. There is not a single grace that is not conveyed by the Word and only by the sacrament. Incorporation into the body of Christ also occurs through faith and receives its sign and seal in baptism.
Herman Bavinck, Reformed Dogmatics 4.521 (My italics)