Hebrews 12:26-28

The earth was rocked at the sound of his voice from the mountain, but now he has promised, “Once and for all I will not only shake the systems of the world, but also the unseen powers in the heavenly realm!” Now this phrase “once and for all” clearly indicates the final removal of things that are shaking, that is, the old order, so only what is unshakable will remain. Since we are receiving our rights to an unshakable kingdom we should be extremely thankful and offer God the purest worship that delights his heart as we lay down our lives in absolute surrender, filled with awe.