Ihya Uloom Uddin (4 Volumes)
The masterpiece of Imam al-Ghazali unquestionably one of the greatest thinkers and theologians of Islam. He reflects on the totality of his studies in Tasawwuf (Sufism) and its related components (purification of the heart soul mind and body) tazkiyya scepticism philosophy and spiritual retreat.
This work known in English as "Revival of the Religious Sciences."
Volume 1 - Book of Worship
Volume 2 - Book of Worldly Usages
Volume 3 - Book of Destructive Evils
Volume 4 - Book of Constructive Virtues.
English translation by Maulana Fazlul Karim.