1 Corinthians 1:17

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 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.

— Matthew Henry's Concise Commentary (public domain)

Paul says this not to depreciate baptism; for he exalts it most highly (Rom 6:3). He baptized some first converts; and would have baptized more, but that his and the apostles' peculiar work was to preach the Gospel, to found by their autoptic testimony particular churches, and then to superintend the churches in general. sent me--literally, "as an apostle." not to baptize--even in Christ's name, much less in my own. not with wisdom of words--or speech; philosophical reasoning set off with oratorical language and secular learning, which the Corinthians set so undue a value upon (Co1 1:5; Co1 2:1, Co1 2:4) in Apollos, and the want of which in Paul they were dissatisfied with (Co2 10:10). cross of Christ--the sum and substance of the Gospel (Co1 1:23; Co1 2:2), Christ crucified. be made of none effect--literally, "be made void" (Rom 4:14); namely, by men thinking more of the human reasonings and eloquence in which the Gospel was set forth, than of the Gospel itself of Christ crucified, the sinner's only remedy, and God's highest exhibition of love.

— Jamieson-Fausset-Brown Commentary (public domain)