See to it that you do not refuse him who speaks. If they did not escape when they refused him who warned them on earth, how much less will we, if we turn away from him who warns us from heaven? At that time his voice shook the earth, but now he has promised, “Once more I will shake not only the earth but also the heavens.” The words “once more” indicate the removing of what can be shaken—that is, created things—so that what cannot be shaken may remain.*
Therefore, since we are receiving a kingdom that cannot be shaken, let us be thankful, and so worship God acceptably with reverence and awe, for our “God is a consuming fire.”
*The name of the city has Hellenic origin, and the word Ἱερουσαλήμ is a compound consisting of two stems: ἱερός for sacred, holy, and σάλευμα for oscillation, shaking.