How could Paul be blameless as to the law when through the law comes the knowledge of sin?

EPISODE #192: Ted asks about how Paul describes himself in Philippians vs what we learn in Romans that the law does with sinners. Rod talks about Paul’s (when Saul) ‘flawless’ striving toward works of the law, that the law is correct to condemn what sinners are, think, and do, and that works cannot and do not save, what (Who) saves, and where faith is directed.