2 Thessalonians

The second letter to the Thessalonians is quite similar to the first in content, but the tone is more terse. Paul's first letter not only did not correct their misconceptions of the second coming,  but caused some to cast off their daily responsibilities and become loafers, living on other believers' expenses. At the same time, false teachers taught that the tribulation these believers were undergoing was a sign that the day of the Lord had arrived, adding more distress and confusion to the already troubled church.

Eschatology is not an easy doctrine; still it is an essential part of the Christian faith, taking up almost five percent of the NT writings. Paul realized the difficulty these young believers had on such teachings, and therefore wrote a follow-up letter to further elaborate on the details concerning the last days.

Paul pointed out that preceding Christ's return there will be rampant apostasy and lawlessness, and the revelation of the man of sin, which at present is restrained until the appointed time. So instead of loafing around and become busybodies, believers should continue to work hard, do good, pray for and support the furtherance of the gospel, and make good use of every opportunity to serve the Lord faithfully as they await His return.

2:16-17
Now our Lord Jesus Christ himself, and God, even our Father who has loved us and has given us everlasting consolation and good hope through grace, 
Comfort your hearts, and stablish you in every good word and work.

OUTLINE OF 2 THESSALONIANS

1. Greetings (1:1-2)
2. Comfort in View of the Lord's Return (1:3-12)
For Discouraged Believers
a. Thanksgiving (1:3-6)
Patience in Persecutions
Faith in Tribulations
b. Supplication (1:7-12)
Vindication by God
Victory and Glory in Christ
3. Correction in View of the Lord's Return (2:1-17)
For Disillusioned Believers
a. Certainty and Signs  (2:1-12)
Apostasy | Antichrist | Anarchy–Lawlessness
Appearance of Christ
b. Consolation and Comfort (2:13-17)
Obtaining Glory | Obeying Truth
4. Conduct in View of the Lord's Return (3:1-18)
For Disobedient Believers
a. Prayer Request | Patience in Waiting (3:1-5)
b. Instructions on Work and Charity (3:6-15)
c. Benediction (3:16-18)