1 Thessalonians 1:5 (NKJV)
5 For our gospel did not come to you in word only, but also in power, and in the Holy Spirit and in much assurance, as you know what kind of men we were among you for your sake.
"Paul shares with us the four outstanding aspects, as he remembered them, of his preaching ministry in Thessalonica - "in word...in power...in the Holy Spirit...in much assurance." - Motyer, Preaching? p110.