Adam Clarke on Philippians 3:6

Concerning zeal - As to my zeal for Pharisaism, I gave the fullest proof of it by persecuting the Church of Christ; and this is known to all my countrymen.

Touching the righteousness - And as to that plan of justification, which justification the Jews say is to be obtained by an observance of the law, I have done every thing so conscientiously from my youth up, that in this respect I am blameless; and may, with more confidence than most of them; expect that justification which the law appears to promise.