In the Principles of the Creed, (Kitab qawaid al-aqaid) second of the forty books of the Revival of the Religious Sciences (Ihyaʾ ʿulum al‐din), Abu Hamid al-Ghazali explains the fundamental beliefs of Islam, those that concern faith in God, His revelation, His messengers, and the hereafter. The scope of these beliefs includes the nature of God, Muhammad’s status as a prophet, the virtues of the Companions, the events related to the resurrection and judgment, and the nature of faith itself. This presentation of beliefs goes beyond a list of creedal statements; Imam al-Ghazali cites the Scriptural foundations in the Quran and hadith, refers to transmitted reports from the Companions and others from the righteous predecessors, and supports these beliefs with rational arguments.

Each chapter includes a discussion of the Qur’anic verses, Hadith, and traditions from the Companions and the pious predecessors related to the subject at hand. Imam al-Ghazali then engages his readers in a heartfelt discourse; he offers proofs, metaphors, and examples to encourage seekers along the path to knowledge of the hereafter.