1 Corinthians 2:1-2, Not With Excellency of Speech
The Apostle Paul preaches the gospel of the crucified Christ. This is the power of God unto salvation. This is the only message that he proclaims. He did not embark on the evangelistic mission that Jesus has called him to do by declaring his own wisdom or his eloquence of speech.
In other words, the Apostle Paul relied upon God, abiding in Christ, through prayer and the power of the Holy Spirit to take the Word of God preached to convert souls.