Having been warned of God's impending judgment at the return of Jesus -- what was described in the Hebrew Bible as the Day of the Lord, the Thessalonians are told just what is at stake for those who will be punished in God's final judgment. They will suffer eternally, completely separated from God.
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Reading the Bible in Its Entirety
If you are planning to read the Bible in its entirety, you should read 2 Thessalonians 1 today.