I Thessalonians 1:4-5 ~ The Call of the Thessalonians
"Not just words. Words are boring. Words are without power. Even the Bible with words on the page sitting on the shelf means nothing unless the Spirit of God ministers those words. Not in word only, but also in power, and in the Holy Spirit, and in much assurance. So it did not happen by word only. It was not just words. But rather it was the demonstration of the power of the Holy Spirit bringing much conviction and confidence, which is what much assurance means."