1 Corinthians 2:1

Now to Him who is able to strengthen you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery which has been kept secret for long ages past,

For Christ did not send me to baptize, but to proclaim the gospel, not in wisdom of word, so that the cross of Christ will not be made empty.

and my word and my preaching were not in persuasive words of wisdom, but in demonstration of the Spirit and of power,

But we speak God’s wisdom in a mystery, the wisdom which has been hidden, which God predestined before the ages to our glory,

of which depths we also speak, not in words taught by human wisdom, but in those taught by the Spirit, combining spiritual depths with spiritual words.

Paul’s Reliance upon the Spirit