God inspired revelation.
Galatians 1:11 But I make known to you, brethren, that the gospel which was preached by me is not according to man.
12 For I neither received it from man, nor was I taught it, but it came through the revelation of Jesus Christ.
Paul said & did a lot of things in his life, but the gospel of Christ was given solely by the inspiration & revelation of Jesus. It wasnt inspired by men. Religion & the traditions of men are. There are practices performed by some, that have zero biblical context, yet taught because men before them taught them. What Paul spoke, was straight from having a revelation & a relationship with God. I havent been given no unknown scriptures but I have been given His established word thousands of times. I know for a fact, they did not come from me. I shouldnt be surprised at this point in my walk, but honestly I am amazed everytime the LORD gives me His word or speaks to me. It revives my soul. I dont ever want to take His word for granted. LORD speak to us Your people, please.