If this man were not of God, he could do nothing. If this man were not of God, etc. - A very just conclusion: God is the fountain of all good: all good must proceed from him, and no good can be done but through him; if this person were not commissioned by the good God, he could not perform such beneficent miracles as these.
Related Commentaries of John 9:33
John 9:33
33 If this man were not of God, he could do nothing.