God certainly desires to save us not through our own righteousness, but through the righteousness and wisdom of someone else or by means of a righteousness which does not originate on earth, but comes down from heaven. So, then, we must teach a righteousness which in every way comes from without and is entirely foreign to us.
Christ desires to have our hearts so free and divested (of our own righteousness and wisdom) that for our sins we fear no denial of grace and for our virtues we seek no glory and vain satisfaction. We even should not boast before men of the righteousness which is ours from Christ; nor should we allow ourselves to be cast down by the sufferings and afflictions which are sent to us by Him.
A true Christian should renounce all things — (all righteousness and wisdom) — that in honor and dishonor he always remains the same, assured that whatever honor comes to him belongs to Christ, whose righteousness and gifts of grace shine forth from Him, and that whatever reproach he endures is inflicted on Christ, (who is in him).
— Martin Luther
Commentary on Romans