Albert Barnes Commentary John 10:21

"Others said, These are not the sayings of one possessed with a demon. Can a demon open the eyes of the blind?" — John 10:21 (ASV)

Not the words, and so on. His words are sober, grave, pious, full of wisdom. The preaching of Jesus always produced an effect. It made bitter enemies or decided friends. So will all faithful preaching. It is not the fault of the gospel that there are divisions, but of the unbelief and mad passions of men.