1 Thessalonians 1:5:

For our gospel came not unto you in word only, but also in power, and in the Holy Ghost, and in much assurance, as ye know what manner of men we were among you for your sake.

Notes on 1 Thessalonians 1:5:

Paul often emphasized that God’s power accompanied his preaching, in contrast to those who preached words with no power.  Because it is the same gospel and the same Holy Spirit, we should expect that the gospel will come to others through us “not in word only, but also in power, and in the Holy Spirit!”

See also:

Trust the Word to Work