This means that we do not "receive" the righteousness of God (or as often expressed, "of Jesus"), as in the classical Evangelical vernacular, nor is it "infused" as in the classical Roman Catholic vernacular. The "righteousness of God" remains His alone, and our "righteousness from God" means that we are found to be "of" the people of God. Paul's argument is that it has always been so, but what has changed is that the Messiah, in Jesus of Nazareth, has now appeared.