Naqisaan ra pir-e kaamil, kaamilaan ra rahnuma

Translation:

Ganj Bakhsh is a manifestation of the Light of God for all people

A perfect guide unto the imperfect ones and a guide unto the perfect ones
Kashf al Mahjub is held in high esteem as the first important treatise on Sufism in Persian

Persian language

Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence...

. The date of the completion of the book cannot be determined with any certainty.