Jeremiah 33:20

We now perceive the purpose of the Prophet in saying, If void ye can make my covenant respecting the day and the night, then abolished shall be my covenant with David and the Levites Now he indirectly touches on the wickedness of the people; for the Jews did, as far as they could, overthrow, by their murmurs and complaints, the covenant of God; for in their adversities they instantly entertained the thought and also expressed it, that God had forgotten his covenant. This want of faith then is intimated by the Prophet, as though he had said, “Why are these complaints? It is the same thing as though ye sought to pull down the sun and the moon from the heavens, and to subvert the difference between day and night, and to upset the whole order of nature; for I am the same God, who has settled the succession of day and night, and has promised that the Church shall continue for ever: ye can, therefore, no more abolish my covenant with David than the general law of nature.” We now then understand the Prophet’s object: for this was not said without conveying reproof; because they were very wicked and ungrateful to God, when they doubted his truth and constancy, respecting the promise as to the perpetual condition of the Church. He in short intimates that they were carried away, as it were, by a blind madness, when they thus hesitated to believe God’s covenant, as though they attempted to subvert the whole world, so that there should be no longer any difference between light and darkness.