Commentaries
12:34-36 The people drew false notions from the Scriptures, because they overlooked the prophecies that spoke of Christ's sufferings and death. Our Lord warned them that the light would not long continue with them, and exhorted them to walk in it, before the darkness overtook them. Those who would walk in the light must believe in it, and follow Christ's directions. But those who have not faith, cannot behold what is set forth in Jesus, lifted up on the cross, and must be strangers to its influence as made known by the Holy Spirit; they find a thousand objections to excuse their unbelief.
34. We have heard out of the law—the scriptures of the Old Testament (referring to such places as Ps 89:28, 29; 110:4; Da 2:44; 7:13, 14).
that Christ—the Christ "endureth for ever."
and how sayest thou, The Son of Man must be lifted up, &c.—How can that consist with this "uplifting?" They saw very well both that He was holding Himself up as the Christ and a Christ to die a violent death; and as that ran counter to all their ideas of the Messianic prophecies, they were glad to get this seeming advantage to justify their unyielding attitude.