This text serves as a comprehensive guide to the Abhidhammattha Sangaha, a foundational manual used to study the complex philosophical and psychological doctrines of Theravada Buddhism. It outlines the various categories of consciousness (citta) and their associated mental factors (cetasikas), explaining how these elements interact to shape human experience. The material explores the nature of reality, detailing the laws of kamma, the process of cognitive functions, and the structural organization of different planes of existence. Furthermore, it provides technical instructions on meditation techniques, distinguishing between the development of tranquillity (samatha) and insight (vipassana). By defining the path to liberation (Nibbana), the source acts as an essential map for both students and practitioners seeking to understand the Buddha's higher teachings. This scholarly edition, edited by Bhikkhu Bodhi, ensures the preservation of orthodox interpretations while making the abstruse subject matter accessible to a modern audience.