But perhaps you are from one of the ten tribes, which were shattered and mixed with others no one knows how. No, I am of the tribe of Benjamin, which remained a faithful ally of the tribe of Judah. Together with it, Benjamin guarded Israel's hope: the temple, all its orders, and all the promises.
In a word, I am a Hebrew of Hebrews, "of pure Jewish origin" (St. Chrysostom).
"Then he passes to what belonged to his free choice. Everything said above was not voluntary. It did not depend on him to be circumcised, to be of the stock of Israel, or of the tribe of Benjamin. Yet in this respect too he had more advantages, although many shared in them. In what, then, is the 'more' of Phil 3:4? Certainly in this also: that he was not a sojourner, that he was from the most honored tribe, and from ancient ancestors such as few had. But since all this was not voluntary, he passes to acts of choice, where this 'more' is visible: as to the law, a Pharisee; as to zeal, persecuting the Church of God. He says this because the preceding words alone do not sufficiently explain the word 'more.' One may be a Pharisee and yet not a great zealot for righteousness. One may dare dangers and do so from love of power, not from zeal for the law, as the chief priests did. But he was not such. As to the righteousness of the law, he was blameless. Therefore, if I surpassed all in noble origin, zeal, character, and life, why did I abandon these high advantages, if not to gain those of Christ, greater and far greater?" (St. Chrysostom).
The Pharisees were zealots for the law. By this zeal he persecuted the Church of God. But while persecuting the Church, or standing for his confession, he neglected none of the legal orders. He strictly kept Sabbaths and new moons, offered sacrifices, and did everything else. Therefore, with respect to this legal righteousness, no one could reproach him in anything.