John Calvin Commentary 1 Corinthians 1:24

"but unto them that are called, both Jews and Greeks, Christ the power of God, and the wisdom of God." — 1 Corinthians 1:24 (ASV)

Both Greeks and Jews. By this contrast, he shows that Christ's unfavorable reception was not due to any fault on His part, nor to the natural disposition of mankind generally. Rather, it arose from the depravity of those who were not enlightened by God. For the elect of God, whether Jews or Gentiles, are not hindered by any stumblingblock from coming to Christ, that they may find in Him a sure salvation.

He contrasts power with the stumblingblock, which was caused by His abasement, and wisdom he contrasts with folly. The sum, then, is this: — “I am aware that nothing except signs affects the obstinacy of the Jews, and that nothing calms the haughtiness of the Greeks, except an empty show of wisdom.”

We ought, however, to disregard this. For even though our Christ, in connection with the abasement of His cross, is a stumblingblock to the Jews and is ridiculed by the Greeks, He is, nevertheless, to all the elect, whatever their nation, at once the power of God unto salvation for surmounting these stumblingblocks, and the wisdom of God for throwing off that mask.