NOTES for Isa 66:22
Our faith in God's goodness necessarily includes the idea of His faithfulness, first of all His faithfulness to His promises. We cannot know when these promises will be fulfilled, and as a rule the ways in which they are fulfilled are beyond our understanding, but their certainty lies at the foundation of our trust in God.
The prophecy of Isaiah that we read today contains two promises from God. First, God speaks of a new heaven and a new earth, of a new Creation, which means that His action in this world is not yet complete. The world in which we now live and which we know is not everything; it is not the ultimate reality. It "will pass away," and therefore we should not be guided too seriously by the ordinances of this world (unlike the ordinances that come from the eternal God).
Second, although the world will become different, there is something from this world that will not disappear but will pass into the new Creation, and this "something" is humanity, "your seed and your name." This saved humanity, together with the new heaven and the new earth, will be before the face of God forever. Do we believe this? Do we want to take part in it?