The book “Introduction to Love or Freedom of the Christian Spirit” reveals some fragments and descriptions of youthful searches for spiritual freedom that were not included in the book “Birds of Heaven”, with all the mistakes inherent in narcissistic and self-willed youth, and comparing them with accumulated analysis and objective conclusions characteristic of sensible and wise old age. This book is subtitled "Freedoms of the Christian Spirit." From the writings of the holy fathers we know that there is “true, enduring freedom. Immortal spirits in the Kingdom of Heaven have such freedom, this inner, spiritual freedom. Whoever among the mortals acquires such freedom, he, and only he, is truly free. Source: