The "Enneads" is a collection of writings by the ancient philosopher Plotinus, who lived in the 3rd century CE. It consists of six groups of nine treatises, exploring topics such as the nature of reality, the soul, and the One, which is the ultimate source of all existence. The work is foundational to the philosophical system known as Neoplatonism. Compiled by Porphyry, a student of Plotinus, the "Enneads" was organized to present Plotinus's ideas systematically. The text emphasizes the importance of inner contemplation and the pursuit of spiritual enlightenment, influencing later philosophical and religious thought, including Christianity and Islam.