The Four Knowledges: Self, Allah, World, and Hereafter

The structural architecture of Kimiya-yi Sa'adat rests on al-Ghazali's conviction that genuine happiness requires four types of knowledge that together provide a comprehensive orientation of the soul. These four knowledges — of the self, of Allah, of the world, and of the hereafter — are not separate domains of information but interconnected aspects of a single spiritual understanding that, when integrated, produces the genuine contentment that the Quran promises.

Knowledge of the self (ma'rifat an-nafs) is presented as the first and foundational knowledge, on the basis of the famous prophetic principle: 'Whoever knows himself knows his Lord.' Al-Ghazali's account of self-knowledge covers the soul's faculties, its natural orientation toward Allah, and the specific diseases and distortions that prevent it from actualizing this orientation. He argues that a person who does not understand his own soul's structure — its capacities, its vulnerabilities, and its potential — cannot understand what he needs in order to flourish, and therefore cannot pursue happiness intelligently.

Knowledge of Allah (ma'rifat Allah) is presented as the direct object of the soul's deepest longing — the knowledge that satisfies the soul's natural yearning for ultimate truth and beauty. Al-Ghazali draws on the Quranic names and attributes of Allah to describe a knowledge that is not merely conceptual but experiential — the kind of understanding that the soul actually experiences as light, expansion, and peace rather than as a collection of theological propositions.

Knowledge of the world (ma'rifat ad-dunya) is necessary precisely because the world is the arena in which the soul's spiritual work takes place. Understanding the world's true nature — its transience, its subordinate value as a means to the hereafter, and the specific ways in which attachment to it corrupts the soul — equips the believer to engage with the world without being enslaved by it.

Knowledge of the hereafter (ma'rifat al-akhirah) provides the believer with the perspective needed to evaluate worldly experience correctly. The realities of death, the grave, the Day of Judgment, and the ultimate destinations of paradise and hellfire are presented not as threats but as the context in which the significance of every daily choice becomes clear.