Tahdhib al-Akhlaq wa-Tathir al-A'raqتهذيب الاخلاق وتطهير الاعراق

The treatise on ethics by the Persian historian, philosopher, scientist, Abu 'Ali Ahmad ibn Muhammad Miskawayh al-Razi (b. ca. 930 - d.1030 Ad). Ibn Miskawayh's scholarly works became models for later generations of Islamic thinkers.
Edited and explained by Nawaf Jarrah.

Ibn Miskuyah (932–1030), (Arabic: مِسْكَوَيْه، أبو علي محمد بن أحمد بن يعقوب مسكويه الرازي) full name Abū ʿAlī Aḥmad ibn Muḥammad ibn Yaʿqūb Miskawayh al-Rāzī was a Persian chancery official of the Buyid era, and philosopher and historian from Parandak, Iran. As a Neoplatonist, his influence on Islamic philosophy is primarily in the area of ethics. He was the author of the first major Islamic work on philosophical ethics entitled the Refinement of Character (تهذيب الأخلاق Tahdhīb al-Akhlāq), focusing on practical ethics, conduct, and the refinement of character. He separated personal ethics from the public realm, and contrasted the liberating nature of reason with the deception and temptation of nature. Miskawayh was a prominent figure in the intellectual and cultural life of his time. (Wiki)