There are two kinds of Christian righteousness, just as man’s sin is of two kinds. The first is alien righteousness, that is the righteousness of another, instilled from without. This is the righteousness of Christ by which he justifies though faith, as it is written in I Cor. 1:30: “whom God made our wisdom, our righteousness and sanctification and redemption.”
This righteousness is primary; it is the basis, the cause, the source of all our own actual righteousness. For this is the righteousness given in place of the original righteousness lost in Adam
Therefore this alien righteousness, instilled in us without our works by grace alone—while the Father, to be sure, inwardly draws us to Christ—is set opposite original sin, likewise alien, which we acquire without our works by birth alone.
The second kind of righteousness is our proper righteousness, not because we alone work it, but because we work with that first and alien righteousness. This is that manner of life spent profitably in good works, in the first place, in slaying the flesh and crucifying the desires with respect to the self, of which we read in Gal. 5:24, “And those who belong to Christ Jesus have crucified the flesh with its passions and desires.” In the second place, this righteousness consists in love to one’s neighbor, and in the third place, in meekness and fear towards God