For you have heard of my former life in Judaism, how I persecuted the church of God violently and tried to destroy it.
13. For ye have heard of my conversation. The whole of this narrative was added as a part of his argument. He relates that, during his whole life, he had such an abhorrence of the gospel, that he was a mortal enemy of it, and a destroyer of the name of Christianity. Hence we infer that his conversion was divine.
What Paul had said more generally, in the preface of this epistle, he now proceeds more particularly to enlarge upon. There he had declared himself to be an apostle of Christ; and here he comes more directly to support his claim to that character and office.
Commenting on Galatians 1:10-24
For ye have heard of my conversation in time past,.... His manner and course of life, in his state of unregeneracy, how diametrically opposite his education and behaviour, his principles and practices, were to the Gospel; which show that he had not received it, nor was he taught it of men.