²³ Thou that makest thy boast in the law, dost thou dishonor God through breaking the law?

²⁴ For, “The name of God is blasphemed among the Gentiles through you,” as it is written.

²⁵ For circumcision verily profiteth if thou keep the law; but if thou be a breaker of the law, thy circumcision is made uncircumcision.

²⁶ Therefore if the Uncircumcision keep the righteousness of the law, shall not his uncircumcision be counted for circumcision?

²⁷ And shall not uncircumcision, which is by nature, if it fulfill the law, judge thee, who having the letter and circumcision dost transgress the law?

²⁸ For he is not a Jew who is one outwardly, neither is that circumcision, which is outward in the flesh.

²⁹ But he is a Jew who is one inwardly, and whose circumcision is that of the heart, in the spirit and not in the letter, and whose praise is not from men, but from God.

Resource by John Piper