Context: 2 Thessalonians was written shortly after the first letter (~51 AD) to correct a serious misunderstanding: some members believed the "day of the Lord" had already come — possibly based on a letter falsely attributed to Paul. This generated practical disorder: why work if the end has already arrived?

The man of lawlessness (ch. 2): Paul teaches that before the "day of the Lord" the apostasy must occur and the "man of lawlessness" must be revealed — the "son of destruction" (2:3–4) who will proclaim himself God in the temple. Who or what "restrains" this man (2:6–7) is one of the greatest enigmas of biblical eschatology — interpreted throughout history as the Holy Spirit, the Roman Empire, the archangel Michael, among others.

The practical response: The eschatological correction generates practical responsibility: "If anyone is not willing to work, let him not eat" (3:10) — one of the Bible's most direct statements on responsibility and work ethic. Paul uses his own example of working with his hands so as not to be a burden to anyone. The letter closes with a blessing of peace "at all times in every way."