“We are bound to thank God always for you, brethren, as it is meet, because that your faith groweth exceedingly, and the charity of every one of you all toward each other aboundeth;”
King James Version (KJV)
1:3 It is highly observable, that the apostle wraps up his praise of men in praise to God; giving him the glory. Your faith groweth - Probably he had heard from them since his sending the former letter. Aboundeth - Like water that overflows its banks, and yet increaseth still.
2Th 1:3 We are bound to thank God. Paul states that he prayed ceaselessly for the Thessalonians (1Th 3:9-13). Here he points out how his prayers were answered. The messenger who had returned to him told him many things concerning the church which filled him with thankfulness. One of these was that their faith groweth exceedingly. Though persecuted, their faith did not fail, but became stronger. And with their faith their "charity", love, "toward each other" also abounded.