Javier Melloni's book explores The Spiritual Exercises of St. Ignatius Loyola alongside three spiritual paths: Ignatian spirituality (Christianity), Yoga (Hinduism), and Zen (Buddhism). Written between 1522 and 1548, the Exercises emphasize personalization and discernment in following Jesus. Melloni highlights the principle of Lex orandi, lex credendi, showing how prayer reflects beliefs and identifying both unique elements and commonalities among the traditions. The ultimate goal is personal transformation and an encounter with the Absolute, examining themes from the Yoga Sutras and Zen practices. Currently, Melloni works at the Cave of St. Ignatius in Manresa, Spain, fostering dialogue on these interrelated spiritual traditions.