John 7:14-18
With the Feast already half over, Jesus showed up in the Temple, teaching. 15 The Jews were impressed, but puzzled: "How does he know so much without being schooled?"
16 Jesus said, "I didn't make this up. What I teach comes from the One who sent me. 17 Anyone who wants to do his will can test this teaching and know whether it's from God or whether I'm making it up. 18 A person making things up tries to make himself look good. But someone trying to honor the one who sent him sticks to the facts and doesn't tamper with reality.”

God was His college and teacher (and He didn’t have to pay Him).