Rom 3:21 But now a righteousness from God, apart from law, has been made known, to which the Law and the Prophets testify.
But now a righteousness from God,
Righteousness - The general usage, according to Webster's, is conformity to a standard.
Whose standard? God's. Is it possible for man to uphold God's standard? Nope, never has been, never will, not while we are living on this earth.