Paul spends three years in Arabia and has Jesus personally teach him.
"But I make known to you, brethren, that the gospel which was preached by me is not according to man. For I neither received it from man, nor was I taught it, BUT IT CAME THROUGH THE REVELATION OF JESUS CHRIST. . . "
"But when it pleased God, who separated me from my mother’s womb and called me through His grace, to reveal His Son in me, that I might preach Him among the Gentiles, I did not immediately confer with flesh and blood, nor did I go up to Jerusalem to those who were apostles before me; BUT I WENT TO ARABIA, and returned again to Damascus. Then after three years I went up to Jerusalem to see Peter, and remained with him fifteen days." (Galatians 1:11-12, 15-18, NKJV