See that you do not refuse him who is speaking. For if they did not escape when they refused him who warned them on earth, much less will we escape if we reject him who warns from heaven. At that time his voice shook the earth, but now he has promised, “Yet once more I will shake not only the earth but also the heavens.” This phrase, “Yet once more,” indicates the removal of things that are shaken—that is, things that have been made—in order that the things that cannot be shaken may remain. Therefore let us be grateful for receiving a kingdom that cannot be shaken, and thus let us offer to God acceptable worship, with reverence and awe, for our God is a consuming fire.
This passage struck me simply because you hardly ever hear evangelicals (including me) talk like this. When’s the last time you heard a sermon warning you not to refuse to listen to God’s Word, because if the punishment was bad under the Old Covenant it will be worse under the New? When’s the last time you thought about how scary God is, and therefore worshiped him “with reverence and awe”?
God forgive us for making you and your Son seem trivial and cute.