Is he then the same God as He who gave Satan power over the person of Job that his "strength might be made perfect in weakness? " How is it that the censurer of the Galatians still retains the very formula of the law: "In the mouth of two or three witnesses shall every word be established? " How again is it that he threatens sinners "that he will not spare" them -he, the preacher of a most gentle god? Yea, he even declares that "the Lord hath given to him the power of using sharpness in their presence!" Deny now, O heretic, (at your cost, ) that your god is an object to be feared, when his apostle was for making himself so formidable!
Source: Against Marcion Book V