Faith does not augment Baptism

"Faith does not establish baptism nor enhance it, and unbelief does not diminish or reduce it.  God’s Word establishes it.  It is the factor that makes baptism work [(caussa baptismi efficiens, the efficient cause of baptism)]."

"Fides non constituit baptismum et eum auget neque incredulitas ei quicquam adimit et minuit, sed verbo Dei constitit, illud est caussa baptismi efficiens."

     Martin Luther, Second sermon on Baptism, Third Sunday after Epiphany, 27 January 1538, as reported by Johann Stol(t)z and trans. Robert Kolb ("'What benefit does the soul receive from a handful of water?': Luther’s preaching on Baptism, 1528-1539," Concordia journal 25, no. 4 (October 1999):  355 (346–363); WA 46, 155 ll. 30-32).