The Eternal, Unchanging Gospel.

In the gospel, God summons worshipers, warns of defeat and judgment to the disobedient, and promises greatest blessings upon the faithful.
Sermon Outline:
I. The summons to worship God (v. 6-7).
II. The prophecy of Babylon's certain defeat (v. 8).
III. The warning of eternal judgment (v. 9-11).
IV. The promise of greatest blessing (v. 12-13).