“Here you see again how highly and precious we should esteem Baptism, because in it we obtain such an unspeakable treasure, which also indicates sufficiently that it cannot be ordinary mere water. For mere water could not do such a thing, but the Word does it, and (as said above) the fact that the name of God is comprehended therein. But where the name of God is, there must be also life and salvation, that it may indeed be called a divine, blessed, fruitful, and gracious water; for by the Word such power is imparted to Baptism that it is a laver of regeneration, as St. Paul also calls it in Titus 3:5.”

Luther LC, VI, 26-27