Then follows an equally exclusively divine act, the impartation of a new nature, which shall secure future obedience (vs. 26, 27). Who can thrust his hand into the depths of man's being, and withdraw one life-principle and enshrine another, while yet the individuality of the man remains untouched? God only. How profound the consciousness of universal obstinacy and insensibility which regards human nature, apart from such renewal, as possessing but a 'heart of stone'! There are no sentimental illusions about the grim facts of humanity here. Superficial views of sin and rose-tinted fancies about human nature will not admit the truth of the Scripture doctrine of sinfulness, alienation from God. They diagnose the disease superficially, and therefore do not know how to cure it. The Bible can venture to give full weight to the gravity of the sickness, because it knows the remedy. No surgery but God's can perform that operation of extracting the stony heart and inserting a heart of flesh. No system which cannot do that can do what men want. The gospel alone deals thoroughly with man's ills. And how does it effect that great miracle? 'I will put My Spirit within you.' The new life-principle is the effluence of the Spirit of God. The promise does not merely offer the influence of a divine spirit, working on men as from without, or coming down upon them as an afflatus, but the actual planting of God's Spirit in the deep places of theirs. We fail to apprehend the most characteristic blessing of the gospel if we do not give full prominence to that great gift of an indwelling Spirit, the life of our lives. Cleansing is much, but is incomplete without a new life-principle which shall keep us clean; and that can only be God's Spirit, enshrined and operative within us; for only thus shall we 'walk in His statutes, and keep His judgments.' When the Lawgiver dwells in our hearts, the law will be our delight; and keeping it will be the natural outcome and expression of our life, which is His life.