Where did Paul get his gospel if he wasn't taught it by the other apostles?
Paul received his gospel directly by the revelation of Jesus Christ, not from man or through instruction by other apostles. He certified that the gospel he preached was not after man, nor did he receive it by man, but it came by revelation from Jesus Christ.
Les explains that Galatians 1:11-12 has Paul certifying and guaranteeing that the gospel he preached was not after man. Paul did not pick up someone else's mantle; he neither received it by man nor was taught it by other men. Instead, he received it by the revelation of Jesus Christ. Les also connects chapter 2 with the Jerusalem council around A.D. 51, parallel to Acts 15, where pressure came to back away from Paul's apostleship and embrace Judaism and circumcision along with belief in Christ.
For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.
More Questions
How did the way Paul received the gospel differ from Apollos?
Apollos had been instructed and taught by men, whereas Paul received everything he had by revelation, showing the difference between them.