Just that Paul was well educated in the scriptures. He even owned several scrolls of the scriptures himself. (Very expensive...like a luxury home mortgage expensive)
And that being formally educated in scriptures and hermeneutic principles is not a bad thing...in fact somewhat needed.
Indeed as he declared in his testimony below:
Acts 22:1-5
Brothers and fathers, listen now to my defense.”
2 When they heard him speak to them in Aramaic, they became very quiet.
Then Paul said:
3 “I am a Jew, born in Tarsus of Cilicia, but brought up in this city.
I studied under Gamaliel and was thoroughly trained in the law of our ancestors. I was just as zealous for God as any of you are today.
4 I persecuted the followers of this Way to their death, arresting both men and women and throwing them into prison,
5 as the high priest and all the Council can themselves testify. I even obtained letters from them to their associates in Damascus, and went there to bring these people as prisoners to Jerusalem to be punished.
Acts 26
Then Agrippa said to Paul, “You have permission to speak for yourself.”
So Paul motioned with his hand and began his defense:
2 “King Agrippa, I consider myself fortunate to stand before you today as I make my defense against all the accusations of the Jews,
3 and especially so because
you are well acquainted with all the Jewish customs and controversies. Therefore, I beg you to listen to me patiently.
4 “The Jewish people all know the way I have lived ever since I was a child, from the beginning of my life in my own country, and also in Jerusalem.
5 They have known me for a long time and can testify, if they are willing, t
hat I conformed to the strictest sect of our religion, living as a Pharisee.
Galatians 1:13–2:10
13 For you have heard of
my former life in Judaism, how I persecuted the church of God violently and tried to destroy it. 14
And I was advancing in Judaism beyond many of my own age among my people, so extremely zealous was I for the traditions of my fathers. 15 But when he who had set me apart before I was born, and who called me by his grace, 16 was pleased to reveal his Son to me, in order that I might preach him among the Gentiles, I did not immediately consult with anyone; 17 nor did I go up to Jerusalem to those who were apostles before me, but I went away into Arabia, and returned again to Damascus.
18 Then after three years I went up to Jerusalem to visit Cephas and remained with him fifteen days. 19 But I saw none of the other apostles except James the Lord’s brother. 20 (In what I am writing to you, before God, I do not lie!) 21 Then I went into the regions of Syria and Cilicia. 22 And I was still unknown in person to the churches of Judea that are in Christ. 23 They only were hearing it said, “He who used to persecute us is now preaching the faith he once tried to destroy.” 24 And they glorified God because of me.
2 Then after fourteen years I went up again to Jerusalem with Barnabas, taking Titus along with me. 2 I went up because of a revelation and set before them (though privately before those who seemed influential) the gospel that I proclaim among the Gentiles, in order to make sure I was not running or had not run in vain. 3 But even Titus, who was with me, was not forced to be circumcised, though he was a Greek. 4 Yet because of false brothers secretly brought in—who slipped in to spy out our freedom that we have in Christ Jesus, so that they might bring us into slavery— 5 to them we did not yield in submission even for a moment, so that the truth of the gospel might be preserved for you. 6 And from those who seemed to be influential (what they were makes no difference to me; God shows no partiality)—those, I say, who seemed influential added nothing to me. 7 On the contrary, when they saw that I had been entrusted with the gospel to the uncircumcised, just as Peter had been entrusted with the gospel to the circumcised 8 (for he who worked through Peter for his apostolic ministry to the circumcised worked also through me for mine to the Gentiles), 9 and when James and Cephas and John, who seemed to be pillars, perceived the grace that was given to me, they gave the right hand of fellowship to Barnabas and me, that we should go to the Gentiles and they to the circumcised. 10 Only, they asked us to remember the poor, the very thing I was eager to do.
Philippians 3:5-6
circumcised on the eighth day, of the people of Israel, of the tribe of Benjamin; a Hebrew of Hebrews; as to the Law, a Pharisee; as to zeal, persecuting the church; as to righteousness under the Law, faultless.