Imputation
The imputation of Christ's active obedience is a doctrine within Reformed theology. It is based on the idea that God's righteousness demands perfect obedience to his law. By his active obedience, Christ has "made available a perfect righteousness before the law that is imputed or reckoned to those who put their trust in him." The Heidelberg Catechism asserts that God grants to the believer "the perfect satisfaction, righteousness and holiness of Christ," so that the Christian can say that it is "as if I never had had, nor committed any sin: yea, as if I had fully accomplished all that obedience which Christ has accomplished for me" (Q&A 60). This imputation therefore constitutes the positive element of justification.
The imputation of Christ's active obedience has its foundation in the idea of a covenant of works made with Adam, though this has been the subject of debate, since covenantal language is not employed until the Noahic covenant in Genesis 6. Machen argues that "if Christ had merely paid the penalty of sin for us and done nothing more we should be at best back in the situation in which Adam found himself when God placed him under the covenant of works." As a result of this, our "attainment of eternal life would have been dependent upon our perfect obedience to the law of God," and we would be certain to fall. Machen goes on to say that Christ was "our representative both in penalty paying and in probation keeping," and that for those who have been saved by him, the probation is over since "Christ has merited for them the reward by his perfect obedience to God's law."
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