What does Hebrews 12:27 mean?
This verse continues an analogy begun in verse 26. In Haggai 2:6, God—in part—prophecies His eventual remaking of creation (Revelation 21:1). This shows that God's power will eliminate all that is temporary and replace it with those things which are eternal. In a sense, this is applied to the old covenant and the new covenant. The old covenant was introduced with a terrible spectacle, on the present earth, which shook the ground (Exodus 19:9–20). This was replaced with the new covenant, which is presented in heaven and the new earth (Hebrews 12:18–24).The point made by the writer here is concluded in the following two verses. Not all things are eternal, and not all things can survive the judgment and holiness of God. In the new covenant, God offers us those things which are truly everlasting, which cannot and will not be swept away with the rest of a fallen world (Hebrews 12:28–29).