Misinterpretations often portray Paul as boasting about his violent past to inflate his credentials, rather than using it humbly to contrast divine grace's power; others confuse 'conversation' as mere speech instead of his former way of life, or detach it from the context of defending his gospel against Judaizers who impugned his authority due to his non-traditional background.
Galatians 1:13
King James Version (1769)
13 For ye have heard of my conversation in time past in the Jews’ religion, how that beyond measure I persecuted the church of God, and wasted it:
Paul reminds the Galatian churches of his past zealous persecution of Christians as a devout Jew, describing how he aggressively opposed and devastated the church 'beyond measure,' to emphasize the radical transformation God achieved in his life through Christ's revelation, thereby authenticating his apostolic authority and the gospel he preaches apart from Jewish legalism.