Throughout the Advis, Naude not only writes about principles and
procedures but also lists and comments on authors who should be
included in public collections. He recommends the acquisition of
materials on esoteric subjects, books on the Cabbala, on mnemonic
devices, and on divination. When discussing the physical arrange,
ment of books, however, Naude rejected mnemonic devices because
they spoil and pervert our natural memory.