The book "The Mystical Element of Religion as Learned from St. Catherine of Genoa and Her Friends, Volume 2 (of 2)" was written by Friedrich von Hugel. In this book, the author explores the mystical aspect of religion through the life and work of Saint Catherine of Genoa and her entourage. The main idea of the book is about inner spirituality and understanding of religion through the prism of personal experience and faith. The author offers readers a deep sense of sacredness and communion with God through an exploration of the life adventures and experiences of the saints. This book is essential for anyone interested in spirituality, religion, and mysticism.