The Lord Jesus will be revealed from heaven with His mighty angels in flaming fire. -- 1:7

Now may our Lord Jesus Christ Himself and God our Father, who has loved us and given us eternal
comfort and good hope by grace,
comfort and strengthen your hearts in every good work and word. -- 2:16-17

Do not grow weary of doing good. -- 3:13

Now may the Lord of peace Himself continually grant you peace in every circumstance. 
-- 3:16

Now we request you, brethren, with regard to the coming of our Lord Jesus Christ and our gathering together to Him, that you not be quickly shaken from your composure or be disturbed either by a spirit or a message or a letter as if from us, to the effect that the day of the Lord has come.  Let no one in any way deceive you, for it will not come unless the apostasy comes first, and the man of lawlessness is revealed, the son of destruction, who opposes and exalts himself above every so-called god or object of worship, so that he takes his seat in the temple of God, displaying himself as being God. -- 2:1-4

And you know what restrains him now, so that in his time he will be revealed.  For the mystery of lawlessness is already at work; only he who now restrains will do so until he is taken out of the way.  Then that lawless one will be revealed whom the Lord will slay with the breath of His mouth and bring to an end by the appearance of His coming. -- 2:6-8