4/30/13 V. 6, When that day comes we will see the complete destruction of the earth. If we look to the earth and the sky, major things will be happening (Rev 6:12-14) and in the end it will vanish and be destroyed (Rev 20:11, 21:1) and along with it the inhabitants of the earth (Rev 6:15-16, 19:21).
But salvation of our God will last forever and his righteousness will never fail.
V. 7, In the meantime, as we wait for these things to happen, we who know our God and depend upon his salvation and righteousness and obey his law, we are not to fear or be discouraged by the contempt of the wicked world in which we live.
V. 8, When we face their reviling we must remember their coming fate. Rev 2:10 says we must not fear what we will suffer. They will not last. In the end they will fade away all that will remain is the righteousness and salvation of God.
V. 9, As the saints under the altar call out for vengeance in Rev 6:9-10, so this prophecy calls for God to awake, put on strength like a weapon and do what he did for Israel in Egypt long ago.
Rahab is a prophetic name for Egypt. The dragon is easily connected with Satan, especially in Revelation, but the entire picture here in Isaiah is of the exodus. So the dragon here may also be a picture of the Nile, which from an arial view looks like a serpent and at flood stage grows wings as a dragon. For a similar example and more explanation see the journal entry on Is 8:5-8. The background image of Satan as the dragon always remains relevant, however (Rev 12:9).
V. 10, In his deliverance of his people God also dried up the Red Sea and turned it into a path. Similarly, he caused Cyrus to dry up the Euphrates River (sometimes called a sea is prophecy) in order to deliver his people from Babylon. And this is what the King of kings and Lord of lords does also in Rev 16:12 to deliver his people.
V. 11, And when we are delivered it will be a day celebration and rejoicing as we enter the gates of the New Jerusalem and every tear shall be wiped away (Rev 5:9-13, 7:9-10, 17, 14:1-4, 19:1-7, 21:1-4, 22:3).