If this man were not from God (ei mh hn outo para qeou). Negative condition of second class with imperfect indicative. Assuming that Jesus is not "from God" (para qeou) as some argued in Acts 9:16 , "he could do nothing" (ouk hdunato poiein ouden). Conclusion of the second-class condition with imperfect indicative (double augment in hdunato) without an as is usual in conditions of possibility, propriety, obligation (Robertson, Grammar, pp. 920,1014). The man has scored with terrific power in his use of Scripture and logic.