Secret of Secrets

A dark brown, textured leather book cover shows signs of aging, stains, and abrasions. Several lines of Persian calligraphy are inscribed directly onto the leather in a faded ink, likely an ownership note or a brief description of the contents.

God is He?

This book? [illegible]?
concerning the expression of the subject? [illegible]?
according to? [illegible]?
in the kingdom of Iran?
written? [illegible]?
[illegible]?