'Preaching' in the Bible

For since, in the wisdom of God, the world through its wisdom did not know God, God was pleased to save those who believe through the nonsense of our preaching.

My message and my preaching were not accompanied by clever, wise words, but by a display of the Spirit's power,

What, then, is my reward? It is to be able to preach the gospel free of charge, and so I never resort to demanding my rights when I'm preaching the gospel.