Muḥammad al-Ġazzālīs Lehre von den Stufen zur Gottesliebe

Iḥiyāʾ ʿulūm ad-dīn (English: The Revival of the Religious Sciences. Arabic: احياء علوم الدين‎) is an 11th-century book written by Abū Ḥāmid Muḥammad ibn Muḥammad al-Ghazali. The book was composed in Arabic and is widely regarded as the most significant Islamic text after the Qur'an. It is regarded as his magnum opus. Spanning over 40 volumes, it deals with the principles and practices of Islam. Some consider his Kimya-e-Sa'adat, written in Persian, as a rewrite of the Ihya'e Ulum-ed'Deen, which is a common misconception.