Galatians 1:13-15

You have heard of my career and former manner of life in Judaism, how I used to hunt down and persecute the church of God extensively and [with fanatical zeal] tried [my best] to destroy it. And [you have heard how] I surpassed many of my contemporaries among my countrymen in [my advanced study of the laws of] Judaism, as I was extremely loyal to the traditions of my ancestors. But when God, who had chosen me and set me apart before I was born, and called me through His grace, was pleased [Is 49:1; Jer 1:5]