Galatians 1:11-12 For I would have you know, brothers, that the gospel that was preached by me is not man's gospel. (12) For I did not receive it from any man, nor was I taught it, but I received it through a revelation of Jesus Christ.
Although Paul was extremely advanced in Judaism, he was unaware of the gospel of Jesus Christ. Paul, as most Jews of the Old Testament era, had a veil over his heart when he read the old covenant. The nation of Israel was under law. While God preserved a small remnant through grace, most Jews pursued righteousness based on works. They stumbled over the stumbling stone [Romans 9:32]. But now grace had come to Paul on the Road to Damascus and He received the gospel directly from Jesus through revelation.
Focus on Christ #57