Jeremiah 31:35,36

Which giveth the sun for a light by day... — The leading thought in the lofty language of this passage is that the reign of law which we recognise in God’s creative work has its counterpart in His spiritual kingdom. The stability and permanence of natural order is a pledge and earnest of the fulfilment of His promises to Israel as a people. The new Covenant of pardon and illumination is to be, what the first Covenant was not, eternal in its duration. We have learnt, through the teaching of St. Paul, while not excluding Israel according to the flesh from its share in that fulfilment, to extend its range to the children of the faith of Abraham, the true Israel of God (Romans 2:28; Romans 4:11).