Naw, Paul had another "source".
"Dear brothers and sisters, I want you to understand that the gospel message I preach is not based on mere human reasoning. I received my message from no human source, and no one taught me. Instead, I received it by direct revelation from Jesus Christ." (Gal. 1:11-12)
Yes, that is correct. Gal 1:15 But when it pleased God, who separated me from my mother's womb, and called me by his grace,
Gal 1:16 To reveal his Son in me, that I might preach him among the heathen; immediately I conferred not with flesh and blood:
Gal 1:17 Neither went I up to Jerusalem to them which were apostles before me; but
I went into Arabia, and returned again unto Damascus.
Gal 1:18 Then after
three years I went up to Jerusalem to see Peter, and abode with him fifteen days.
Paul went to the same place that the Israelites were at Mount Horeb, "in Arabia" and received the commandments of God. Paul went there and was taught "the mystery of the ages" by Jesus.
What do you think was "the mystery of the ages"? Does Paul tell us? Mar_4:11 And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables:
Eph_6:19 And for me, that utterance may be given unto me, that I may open my mouth boldly, to make known the mystery of the gospel,
Col_1:26 Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints:
What is the mystery? Is it not "How can God remarry Israel and not break His own Law (Deut. 24:1-4)? The answer is found in Jesus Christ, Immanuel, God with us.
As a side note, in regards to the mystery of the gospel of the kingdom