Philippians 3:6

Concerning zeal, persecuting the church. His zeal for Judaism was demonstrated by the fact that he was a persecutor of the church (Ac 22:4). What were his feelings concerning this part of his career in shown in 1Ti 1:13-16.

Touching the righteousness which is in the law, blameless. Keeping the letter of the law so as to be blameless in the eyes of my fellow-Jews.

1 Timothy 1:13

Who was before a blasphemer, and a persecutor, and injurious. Paul never could forget his old life, before he was converted.

But I obtained mercy, because I did [it] ignorantly in unbelief. The reason is that he was honest, sincere in his opposition, being an unbeliever, and acting ignorantly. Had he been a willful sinner, he would never have been chosen.
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