NET
4 My conversation and my preaching were not with persuasive words of wisdom, but with a demonstration of the Spirit and of power,
Darby
4 and my word and my preaching, not in persuasive words of wisdom, but in demonstration of [the] Spirit and of power;
KJV
4 And my speech and my preaching [was] not with enticing words of man's wisdom, but in demonstration of the Spirit and of power: