1 Corinthians 2:1-3

2:1 When I came to you, brothers and sisters, I did not come with superior eloquence or wisdom as I proclaimed the testimony of God. 2:2 For I decided to be concerned about nothing among you except Jesus Christ, and him crucified. 2:3 And I was with you in weakness and in fear and with much trembling.

1 Corinthians 2:13

2:13 And we speak about these things, not with words taught us by human wisdom, but with those taught by the Spirit, explaining spiritual things to spiritual people.