The apostle asked for their prayers that he would be preserved in his labors. He desired their continued patient waiting for the Christ and their hearts to be directed to the love of God.
In the first letter Paul exhorted them to work with their hands and provide for themselves, not to lean upon others. Some continued in their careless ways, so he commanded the saints to withdraw from one who walked disorderly. The apostle had set the pattern for them by making tents to provide for himself while he preached the gospel among them. He commanded the disorderly ones "that with quietness they work, and eat their own bread." Otherwise the saints should not company with them. Paul desired that they might have peace from the Lord of peace.
Paul signed this letter with his own hand and mentioned it because someone must have written a letter and signed Paul's name to set forth the false doctrine that the day of the Lord had come.