Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Donatist Controversy.: Chapter 6

Chapter 6.—7.  Wherefore, whether a man receive the sacrament of baptism from a faithful or a faithless minister, his whole hope is in Christ, that he fall not under the condemnation that "cursed is he that placeth his hope in man."  Otherwise, if each man is born again in spiritual grace of the same sort as he by whom he is baptized, and if when he who baptizes him is manifestly a good man, then he himself gives faith, he is himself the origin and root and head of him who is being born; whilst, when the baptizer p. 522 is faithless without its being known, then the baptized person receives faith from Christ, then he derives his origin from Christ, then he is rooted in Christ, then he boasts in Christ as his head,—in that case all who are baptized should wish that they might have faithless baptizers, and be ignorant of their faithlessness:  for however good their baptizers might have been, Christ is certainly beyond comparison better still; and He will then be the head of the baptized, if the faithlessness of the baptizer shall escape detection.