What does the Bible say about Christ preaching through His preacher?

In Romans 15:20-25, Paul emphasizes how Christ worked through him to preach the gospel, particularly to the Gentiles. Paul did not take glory in his own abilities but attributed all effectiveness in his ministry to the power of Christ. He became obedient to the Lord and effectively preached by the Spirit's might. This highlights the importance of recognizing that all preaching is ultimately Christ preaching through His messengers, affirming His role as the head of the church and the source of gospel proclamation.