And this word, Yet once more, signifieth the removing of those things that are shaken, as of things that have been made, that those things which are not shaken may remain.
Verse 27. And this word, Yet once more. That is, this reference to a great agitation or commotion in some future time. This is designed as an explanation of the prophecy in Haggai; and the idea is, that there would be such agitations that everything which was not fixed on a permanent and immovable basis would be thrown down as in an earthquake.
The Jewish church was gross and earthly, dark and terrible, meant to strike dread; the gospel state is spiritual, clear, and mild. Mount Sinai demanded external obedience through fear; Mount Zion appeals to hope and the heart. Yet apostasy from the gospel is no less dreadful in its consequences than apostasy from Moses.
AI summary
Commenting on Hebrews 12:18-29
this word, Yet once more--So Paul, by the Spirit, sanctions the Septuagint rendering of Hag 2:6, giving an additional feature to the prophecy in the Hebrew, as rendered in English Version, not merely that it shall be in a little while, but that it is to be "once more" as the final act. The stress of his argument is on the "ONCE." Once for all; once and for ever.