God Swore In His Wrath - Let Us Tremble

From Psalm 95 The Treasury of David
If the children of Israel could say, "Let not God speak to us, lest we die, what would they have said had God then sworn against them?" It is terrible to hear an oath from the mouth but of a poor mortal, but from the mouth of an omnipotent God, it does not only terrify, but confound. An oath from God is truth delivered in anger; truth, as I may so speak, with a vengeance. When God speaks, it is the creature's duty to hear; but when he swears, to tremble.—Robert South.