Jeremiah 31:36

He mentions things which are contrary, but not inconsistent, though different. For the course of the sun, moon, and stars is regular and fixed, and so he calls their courses חקת cheket, and החקים echekim, that is, decrees, which are not changeable. Then in the heavens we find an order so arranged and regulated, that nothing deviates from its appointed course. But in storms and tempests God seems as though he would shake the world and overturn what appears otherwise immovable; for even the very rocks, as it were, tremble when the sea is violently stirred up; and yet God calms the very sea, and thus puts an end to storms and tempests, so that there ever appears to be a stability and a perpetuity in nature. He then adds, If removed shall these laws be from my presence, the seed of Israel shall also fail; that is, “As certain as is the stability of the order of nature, seen in the course of the sun and the moon, and in the turbulent sea, so certain will be the deliverance of ray Church, nor can it ever be destroyed.” The tempest on the sea seems to shake the world, and yet the world remains fixed. The sun and moon, when they rise, might overwhelm the whole earth; for we know that the sun is much larger than the earth. While so large a body, and almost immeasurable, hangs over our heads, and rolls on so swiftly, who ought not to be afraid? Yet the sun proceeds in its course, and the earth remains firm, because it so pleases God. There is, therefore, no reason to fear that the safety of the Church should ever fail, for the laws or decrees of nature shall never cease; that is, God, who has from the beginning governed the world, will not disregard the welfare of his Church, for whose sake the world has been created.

Nor, indeed, is it a matter of wonder, that the safety of the Church is here shewn to be so secure, for it may justly be preferred even to the fixed course of the sun and of the moon, and to other institutions of nature. But God deemed it enough in this place to use this comparison, according to what is said in the Psalms, where the sun and the moon are called his faithful witnesses in heaven. (Psalm 89:36, 37) But there also the covenant is spoken of, which God was about to make with his people through his only-begotten Son. He mentions the moon as his witness in heaven; but as I have already said elsewhere, he raises us far above the world and above all the elements, yea, above the sun and the moon, when he treats of the certainty of our salvation; and, doubtless, the condition of the Church does not depend on the state of the world; for it is said in another place,

“They shall grow old, but thou wilt remain for ever.” (Psalm 102:26-28)

And the Prophet there compares the heavens to garments, which wear out by use, and at length become useless; but the condition of the Church, he says, is far different. He does not, indeed, express these words; but after having said, “Thou, O God, art the same from eternity,” he comes to the eternity of the Church, “Thy children’s children shall endure.” We now see that the Church has the preference over the whole world. But God had a regard in this place to the weakness of his people, when he said that his grace to his people would be as sure and certain as the institutions of nature. Some refer the last clause in verse 35 (Jeremiah 31:35) to the Red Sea; because God divided the Red Sea; but this is wholly foreign to the meaning of the Prophet, nor does it require any confutation; but I have pointed it out that no one may be led astray.