But if ye believe not his writings, how shall ye believe my words? But if ye believe not his writings, etc. - If you lay them not to heart - if you draw not those conclusions from them which their very letter, as well as their spirit, authorizes you to draw, how shall ye believe my words, against which ye have taken up the most ungrounded prejudice? It is no wonder that we find the Jews still in the gall of bitterness, and bond of iniquity: as they believe not Moses and the prophets, in reference to the Messiah, it is no marvel that they reject Christ and the apostles. Till they see and acknowledge, from the law and the prophets, that Christ must have come, they will never believe the Gospel. St. Paul says, 2 Corinthians 3:15, that even until this day, when Moses (i.e. the law) is read, the Veil is upon their hearts: - so that they see not to the end of that which is abolished: 2 Corinthians 3:13. Nor will this veil be taken away, till they turn from worldly gain and atheism (which appears to be their general system) to the Lord, 2 Corinthians 3:16; and then the light of the glory of God shall shine on them in the face (through the mediation and merits) of Jesus Christ.
It appears that this discourse of our Lord had effectually confounded these Jews, for they went away without replying - a manifest proof they had nothing to say.
1. In all periods of their history, the Jews were both an incredulous and disobedient people: perhaps it was on this ground that God first chose them to be keepers of his testimonies; for had they not had the most incontrovertible proofs that God did speak, they would neither have credited nor preserved his oracles.
Their incredulity is, therefore, no mean proof of the Divine authority of the law and the prophets. The apostles, who were all Jews, partook deeply of the same spirit, as various places in the Gospel prove; and, had not they had the fullest evidence of the divinity of their Master, they would not have believed, much less have sealed the truth with their blood. Thus their incredulity is a strong proof of the authenticity of the Gospel.
2. When a man, through prejudice, bigotry, or malevolence, is determined to disbelieve, both evidence and demonstration are lost upon him: he is incapable of conviction, because he is determined not to yield. This was, this is, the case with the Jews - there are facts before their eyes sufficient to convince and confound them; but they have made a covenant with unbelief, and therefore they continue blind, ignorant, and wicked; obstinately closing their eyes against the light; and thus the wrath of God is coming upon them to the very uttermost. But shall not a rebellious and wicked Christian be judged worthy of more punishment? Certainly: for he professes to believe that truth which is able to make him wise unto salvation, by faith in Jesus Christ. Reader, it is an awful thing to trifle with the Gospel! - the God of it is pure, jealous, and holy. Come unto him and implore forgiveness of thy past sins, that thou mayest have eternal life.
Commentary on the Bible, by Adam Clarke [1831].