1 Corinthians 2:4

4Andκαὶtheὁmessageλόγοςof meμουandκαὶtheτὸpreachingκήρυγμάof meμου[were] notοὐκinἐνpersuasiveπειθοῖof wisdomσοφίαςbutἀλλ’inἐνdemonstrationἀποδείξειof [the] Spiritπνεύματοςandκαὶof powerδυνάμεως,

And my speech and my preaching [were] not in persuasive words of wisdom, but in demonstration of the Spirit and of power,