Tertullian

“ No farmer will irrigate ground that will yield him no fruit in return, except he be as stupid as Marcion’s god. Why then impose sanctity upon our most infirm and most unworthy flesh, either as a burden or as a glory? What shall I say, too, of the uselessness of a discipline which sanctifies what is already sanctified? Why burden the infirm, or glorify the unworthy? Why not remunerate with salvation what it burdens or else glorifies? Why keep back from a work its due reward, by not recompensing the flesh with salvation? ”

“ If the regeneration of man, how can he regenerate, who has never generated? For the repetition of an act is impossible to him, by whom nothing any time has been ever done. If the bestowal of the Holy Ghost, how will he bestow the Spirit, who did not at first impart the life? For the life is in a sense the supplement [3] of the Spirit. He therefore seals man, who had never been unsealed [4] in respect of him; [5] washes man, who had never been defiled so far as he was concerned; [6] and into this sacrament of salvation wholly plunges that flesh which is beyond the pale of salvation! ”