Paul wrote to the Corinthians that his words were not “wise and persuasive” but rather a “demonstration of the Spirit’s power” in order that their faith “might not rest on men’s wisdom, but on God’s power” (1 Cor. 2:4–5 NIV). Later in the same letter he reiterates that “the kingdom of God is not a matter of talk but of power” (4:20 NIV).