This work explores the origins, life, and legacy of Pythagoras, framed as the father of philosophy whose intellectual and spiritual reach transformed antiquity. Iamblichus traces the philosopher's divine lineage, his extensive travels through Egypt and Babylon, and his eventual establishment of the community in Magna Græcia. The narrative examines the structure of the Pythagorean order, distinguishing between the mathematical scholars and the strict listeners of the oral tradition, while detailing their shared lifestyle and communal property.
The text delves deeply into the ethical framework established by Pythagoras, emphasizing justice, temperance, and piety toward the gods. Central to the teaching is the belief that the human soul is immortal and subject to transmigration, requiring constant purification through mathematics, music, and virtue. Iamblichus records numerous accounts of Pythagoras's profound influence on politics, animal behavior, and human passions, portraying him as a figure of near-divine wisdom.
Special attention is given to the musical theories discovered by Pythagoras, mapping harmonious ratios to the weights of hammers and lengths of chords. The biography presents these discoveries not merely as acoustic science, but as reflections of a harmonious cosmos governed by numerical proportion. Music is shown as a therapeutic tool capable of aligning the soul's irrational impulses with reason.
The book also compiles ethical fragments from early Pythagoreans such as Hippodamus, Euryphamus, and Archytas, exploring the nature of felicity and human happiness. These writers argue that human life requires both virtue and prosperity to achieve true perfection, though virtue remains the load-bearing pillar of the soul. The distinction between self-perfect divine existence and human striving forms a recurring core argument.
Later sections address the political role of the Pythagoreans, their establishment of just legislation across various cities, and the eventual violent backlash driven by political factions. The narrative details the destruction of the community in Crotona, the scattering of the survivors, and their tireless preservation of the doctrine through secret commentaries and symbols.
The concluding portions focus heavily on the mechanics of piety, detailing appropriate sacrifices, purifications, and the sacred nature of oaths. Iamblichus closes with a comprehensive catalog of the most famous Pythagoreans, anchoring the philosophical lineage in historical reality. The work ultimately paints a portrait of a philosophical tradition designed to elevate the human intellect toward the divine.
