1 Corinthians 2:4

2:4 My conversation and my preaching were not with persuasive words of wisdom, but with a demonstration of the Spirit and of power,

1 Corinthians 2:12-13

2:12 Now we have not received the spirit of the world, but the Spirit who is from God, so that we may know the things that are freely given to us by God. 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.