Epistle to the Son of the Wolf — Paragraph 254
Source (Persian)
يا هادی کتابش نزد تو حاضر است انکه اسمش را مستيقظ گذارده بخوان اگر چه ديده ای و لکن مکرّر مشاهده نما لعلّک تتّخذ لنفسک فی خباء الصّدق مقاما رفيعا *
Translation
O Hádí! His book which he hath entitled "Mustayqiz" is in thy possession. Read it. Although thou hast seen the book, peruse it again, that haply thou mayest obtain for thyself a lofty seat beneath the canopy of truth.