Hebrews 12:25-29 (HCSB) 25 See that you do not reject the One who speaks; for if they did not escape when they rejected Him who warned them on earth, even less will we if we turn away from Him who warns us from heaven. 26 His voice shook the earth at that time, but now He has promised, Yet once more I will shake not only the earth but also heaven. 27 Now this expression, "Yet once more," indicates the removal of what can be shaken --that is, created things--so that what is not shaken might remain. 28 Therefore, since we are receiving a kingdom that cannot be shaken, let us hold on to grace. By it, we may serve God acceptably, with reverence and awe; 29 for our God is a consuming fire.