The baptism of the Spirit is already his: it is fitting and natural, therefore, that he should have the baptism of water:
"Water baptism . . . is an external and public testimony of the inward baptism of the Spirit, set forth by receiving water. By this not only are sins confessed, but also faith in their pardon, by the death and resurrection of our Lord Jesus Christ, is declared before all men. Hereby also the recipient is externally marked, inscribed and incorporated into the fellowship of the churches, according to the ordinance of Christ. Publicly and orally he vows to God, by the strength of God the Father, Son, and Holy Spirit, that he will henceforth believe and live according to the divine word, and in case he should be negligent, that he will receive brotherly admonition, according to the order of Christ in Matt. xviii. Such are the genuine baptismal vows, which we have lost for a thousand years, Satan meanwhile crowding in with his monastic and priestly vows, and putting them in place of the holy.
"The third error, that we have called the water of baptism, as well as the bread and wine of the altar, a sacrament, and have so regarded them; though not the water, bread or wine, but the vow of baptism or love-plight properly and rightly is a sacrament; which in Latin is an oath-plight and promise with joining of hands, which the baptised make to Christ, our invincible leader and head, that he will contend manfully under his flag and banner in Christian faith until death."
- Table of Christian Doctrine, Op. 11; Hoschek, ii., 254.
- Form for Baptising, Op. 19.