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Pope St. John XXIII
The saint who called the Second Vatican Council, Pope John XXIII, kept a diary practically his whole life, beginning when he was 14. Angelo Roncalli jotted down thoughts about his own spiritual progress in notebooks and scraps of paper, all of which were eventually collected and published as Journal of a Soul. “These unpremeditated notes, written at night by the flickering light of an oil lamp, consist of reminiscences of ascetic effort reconsidered in tranquility,” wrote Cardinal Loris Capovilla, Pope John’s personal secretary and editor of the volume.