This work, Kitab al-Arbain fi Usuluddin, has major headings into which the 40 principles are divided. They range from discussions on the pillars of Islam to the Essence of God to the Major Sins of the Soul. The Discussions are of varying lengths, and al-Ghazzali has covered a wide area, having extracted what he saw as the most fundamental issues governing the state of humans to enumerate his ideas.
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