The Assumption Is Proved
If God justifies us (that is, declares and pronounces us to be righteous), he does then declare his own righteousness, that he might be just; then he does not declare us to be righteous in Christ, upon the sight and evidence of our sanctification, which is a righteousness of our own.
But when God justifies us, that is, first declares us, and pronounces us to be righteous, he does declare his own righteousness; that he might be just.
Therefore he does not first pronounce and declare us righteous upon sight, and evidence of our sanctification, which is a righteousness of our own.