The Apostle Paul’s claim is that his utterance is God-given and Spirit-led. This is a proof text for infallibility of the preaching ministry of the apostles. Today, the apostles are no longer with us. But the Word of God that is written down is preserved for us today (Matt 5:17-18, Psalm 12:6-7). Today, we are to preach the Word of God as the Spirit of God teach us in our study of Scriptures. Our authority is in the Word of God recorded for us today.