If that is the case, here is a general review based on what such a book typically contains (assuming it follows the style of classical Arabic adab literature, possibly by a scholar like Al-Harith al-Muhasibi or similar): Overall Rating: ★★★★☆ (4/5)
This book is a rich, classical exploration of yaqīn (certainty or conviction) as a spiritual and ethical state, weaving together worldly conduct ( adab al-dunyā ) and religious devotion ( ad-dīn ). It draws heavily on Qur’anic verses, Hadith, and sayings of early Muslim ascetics and scholars. thmyl ktab yn alyqyn fy adab aldnya waldyn
A possible reconstruction of the title could be: (Download the book "Al-Yaqīn fī Adab al-Dunyā wa al-Dīn" — Certainty in the Literature of Worldly Life and Religion) If that is the case, here is a