“For I would have you know, brothers, that the gospel that was preached by me is not man’s gospel. For I did not receive it from any man, nor was I taught it, but I received it through a revelation of Jesus Christ” (Galatians 1:11-12).
Paul has claimed that only the gospel preached by him is the true gospel. That raises the question how Paul can be so sure. Why should people trust him and not other teachers holding a different opinion? Well, Paul says, I did not make this up myself, nor did I receive it from other people. Jesus Christ Himself revealed it to me. And He is the most trustworthy source of information we can imagine.
When Paul was not yet a believer, he met the risen Jesus personally. This encounter changed Paul’s life completely. Not only did he finally realize that Jesus really is the Son of God and Savior of humanity; Paul was also appointed as a witness of this insight (and many more important insights from the Gospel). He was to spread this good news to other people in different countries.
That’s exactly what Paul did for the rest of his life: he shared what Jesus had taught him. Much of his teaching has been handed down to us in the Bible. We can be sure that the Bible teaches us the truth, for its message comes from God!