And he studied with tremendous diligence and he learned a very great deal; "shas (Talmud)," and "poskim (halachic deciders)," and "Ta.Na.Ch. (Torah, Neveim-prophets, Kesuvim-scriptures)," and "Ain Yaakov (an anthology of the agada of the Talmud with commentaries)," and the books of the Zohar, and Tikunay Zohar, and all the "Kisvay (writings of) Hu-Ari (The lion, also acronym Rabbi Isaac (Luria)) o.b.m., and a vast amount of the other books, and "sifray (books of) mussar (ethics)," very abundantly.
And he said: that all the small books that speak of mussar (ethics), all of them where in his father's house. And he studied from all of them. He also learned a lot of "Raishis Chuchmuh (Beginning of Knowledge, a work of ethics authored by a disciple of the Ramak, based on Kabbalah)," and he said explicitly: that he learned the book Raishis Chuchmuh countless times (t.n. see the Words of Yisroel Dov Odesser where he tells over about R' Tzvi Hersch Rosenthal who was very keen on this work).
And the greatness of his vast proficiency in all the books as can be seen ostensibly somewhat, was without limit, and especially in the books of Ta.Na.Ch. and Ain Yaakov and all the Kisvay Hu-Ari and the books of the Zohar and Tikunim there is no one in the world to be found of his caliber. Because the whole Torah in its entirety was ready before him, fluent in his mouth, like a set table mamash, like something placed before the person before his eyes so that he could take for himself what he desires, similarly all the holy books were mamash set before the eyes of his holy intellect whenever he desired. And a bit of this can be seen and discerned in his holy books.
Na Nach Nachma Nachman Meuman!