I was with you in weakness and in fear and in much trembling, and my message and my preaching were not in persuasive words of wisdom, but in demonstration of the Spirit and of power so that your faith would not rest on the wisdom of men, but on the power of God (1 Corinthians 2:3-5).
"To have your faith rest on God’s power in the context of 1:18–2:5 is to believe the cross to be the way of salvation, being convinced by the work of the Spirit in your own and other believers’ lives, and to shun any trust in self and human wisdom as a way to God. Just as in Romans, Paul teaches that to attain righteousness a person must dismiss their own righteousness, so in 1 Corinthians to receive God’s wisdom and experience his power it is necessary to relinquish your own wisdom and power." (Ciampa, Roy E., and Brian S. Rosner. The First Letter to the Corinthians (Pillar New Testament Commentary). Wm. B. Eerdmans Publishing Company, 2010, 119.)