1 Corinthians 1:17-25 Christ crucified is the foundation

Paul had been bred up in Jewish learning; but the plain preaching of a crucified Jesus, was more powerful than all the oratory and philosophy of the heathen world. This is the sum and substance of the gospel. Christ crucified is the foundation of all our hopes, the fountain of all our joys. And by his death we live. The preaching of salvation for lost sinners by the sufferings and death of the Son of God, if explained and faithfully applied, appears foolishness to those in the way to destruction. The sensual, the covetous, the proud, and ambitious, alike see that the gospel opposes their favourite pursuits. But those who receive the gospel, and are enlightened by the Spirit of God, see more of God's wisdom and power in the doctrine of Christ crucified, than in all his other works. God left a great part of the world to follow the dictates of man's boasted reason, and the event has shown that human wisdom is folly, and is unable to find or retain the knowledge of God as the Creator. It pleased him, by the foolishness of preaching, to save them that believe. By the foolishness of preaching; not by what could justly be called foolish preaching. But the thing preached was foolishness to wordly-wise men. The gospel ever was, and ever will be, foolishness to all in the road to destruction. The message of Christ, plainly delivered, ever has been a sure touchstone by which men may learn what road they are travelling. But the despised doctrine of salvation by faith in a crucified Saviour, God in human nature, purchasing the church with his own blood, to save multitudes, even all that believe, from ignorance, delusion, and vice, has been blessed in every age. And the weakest instruments God uses, are stronger in their effects, than the strongest men can use. Not that there is foolishness or weakness in God, but what men consider as such, overcomes all their admired wisdom and strength.

  The manner in which Paul preached the gospel, and the cross of Christ: Not with the wisdom of words (1cor 1:17)

the enticing words of man's wisdom (1cor 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 of the faction in this church that most opposed this apostle. He did not preach the gospel in this manner, lest the cross of Christ should be of no effect, lest the success should be ascribed to the force of art, and not of truth; not to the plain doctrine of a crucified Jesus, but to the powerful oratory of those who spread it, and hereby the honour of the cross be diminished or eclipsed. Paul had been bred up himself in Jewish learning at the feet of Gamaliel, but in preaching the cross of Christ he laid his learning aside. He preached a crucified Jesus in plain language, and told the people that that Jesus who was crucified at Jerusalem was the Son of God and Saviour of men, and that all who would be saved must repent of their sins, and believe in him, and submit to his government and laws. This truth needed no artificial dress; it shone out with the greatest majesty in its own light, and prevailed in the world by its divine authority, and the demonstration of the Spirit, without any human helps. The plain preaching of a crucified Jesus was more powerful than all the oratory and philosophy of the heathen world.   To those who perish it is foolishness, but to those who are saved it is the power of God, 1 cor 1:18

It is to the Jews a stumbling-block, and to the Greeks foolishness; but unto those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God, 1cor 1:23,24.

It is the will of God that all our glorifying should be in the Lord: and, our salvation being only through Christ, it is thereby effectually provided that it should be so. Man is humbled, and God glorified and exalted, 1 cor 1:31.