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 Sufism, skepticism, philosophy, and spiritual retreat. This work, known in English as "Revival of the Sciences." Volume 1 - Book of Worship, Volume 2 - Book of Worldly Usages, Volume 3 - Book of Destructive Evils, Volume 4 - Book of Constructive Virtues.