I think most understand this smvoice.....yet even the disciple's had difficulty with the truth and where they were in God's Program...and so will we.... who can sometimes be just as “slow and hard to understand” as Jesus said His disciple's were...........Many times He mentioned how long he'd been with them and yet they still did not understand.
Peter wasn't just making an off-hand remark about Paul's writings. He specifically spoke of Paul's writings as being hard to be understood. Because Paul's writings had to do with the MYSTERY, kept secret in God since the world began, until revealed to Paul from direct revelations from the risen Christ. THAT was the "wisdom given unto him". And it was different that the wisdom given to Peter and the 11. Otherwise, Peter would have had no problem with Paul's revelations. See Galatians, Chapter 2. It was no small tidbit of advice that Peter wrote about concerning Paul's scriptures.