For Jews demand signs and Greeks seek wisdom,
22. For the Jews require a sign This is explanatory of the preceding statement — showing in what respects the preaching of the gospel is accounted foolishness At the same time he does not simply explain, but even goes a step farther, by saying that the Jews do not merely despise the gospel, but even abhor it.
We have here, I. The manner in which Paul preached the gospel, and the cross of Christ: Not with the wisdom of words (Co1 1:17), the enticing words of man's wisdom (Co1 2:4), the flourish of oratory, or the accuracies of philosophical language, upon which the Greeks so much prided themselves, and which seem to have been the peculiar recommendations of some of the heads...
Commenting on 1 Corinthians 1:17-31
For the Jews require a sign,.... The Jews had always been used to miracles, in confirmation of the mission of the prophets sent unto them, and therefore insisted on a sign proving Jesus to be the true Messiah; except signs and wonders were wrought, they would not believe; and though miracles were wrought in great numbers, and such as never man did, they remained incredulous...