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And as in Romans 3: 21 the "but now!" of the revelation of the righteousness of God by faith is the redeeming word in man's situation of death under the guilt of sin and the condemning force of the law, so the "now therefore" of Romans 8:1ff. is the word of liberation for man under the power of sin and under the impotent regime of the law which cannot conquer the flesh. The antithesis between the law and the Spirit is thus not situated in the fact that the Spirit places himself over against the content and demand of the law. Rather, the object of the sending of Christ and of the Spirit represented by him is that the just demand of the law should be fulfilled, completed, finished, not only in Christ, but also in us (Rom. 8: 4).
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Herman N. Ridderbos (Paul: An Outline of His Theology)