Giussani, Luigi. “Luigi Giussani’s Introduction to the Spiritual Exercises for the C. Péguy Cultural Center (Varigotti, November 1, 1968),” edited by Julián Carrón. In Alive Means Present! Beginning Day for Adults and University Students of Communion and Liberation, 3-12. Pdf and epub. Accessed June 15, 2022. https://english.clonline.org/traces/page-one/alive-means-present. [Translation].