Albert Brown says Joseph can translate papyri "without wisdom of this world."
Albert Brown, Letter to James Brown, 1 November 1835; rep. Christopher C. Lund, “A Letter Regarding the Acquisition of the Book of Abraham,” BYU Studies 20, no. 4 (1980): 403
I will relate one incident that hapened not long since in our favour by some men that had four Egyptian mummis which th[e]y were carr[y]ing through the world to exhibit and also an ancient record that was found in their coffins, this record containing som of the history of Josef while in egypt and also of Jacob and many prophesies Delivered by them. These records were bought by the church and also the Mummis and are now in Kirtland. They bought the Mummis for the sake of the record and paid 2400 hundred dollars for them. Many of the learned have been to kirtland to examine the characters but none of them have been able to tell but very little about them and yet Joseph without any of the wisdom of this world can read them and know what they are.