Journal of a Soul is the personal spiritual diary of Pope John XXIII (Angelo Giuseppe Roncalli) that chronicles his spiritual journey from adolescence, seminary, and eventual accession to the papacy. It documents Roncalli's spiritual growth from the age of 14, revealing his humility, profound reflection, and dedication to holiness, making it one of the most intimate and inspiring spiritual autobiographies, demonstrating his growing spiritual maturity as he served as a priest, bishop, papal diplomat, Patriarch of Venice, and finally Pope.