In today’s passage it begins with a thanksgiving. Specifically, a thanksgiving expressed by Paul which details his conviction that the word of God worked in a mighty way in the lives of the Jesus-followers he’s writing to in Thessalonica. This “word of God” certainly includes scripture, but because the New Testament wasn’t complete in Paul’s day in the way we have it today, it also can encompass the message of the Good News itself as well as the God-given truths proclaimed and passed on by His prophets and preachers. The ability of the word to “go to work” among God’s people was not merely something the church in Thessalonica experienced and enjoyed, but something even today’s church can experience and enjoy! 
(1 Thessalonians 2:13-16)