The Mystery of the Church represents the final writings of Fr. Humbert Clerissac, O.P. In it, readers will find much-needed spiritual nourishment, gaining insights into the beauty and glory of the Church's manifold mysteries. As Jacques Maritain writes in the Preface, Fr. Clerissac "asked of those who came to him to adhere fully to the mystery of the Church." This adherence, for Fr. Clerissac, depended on the dynamic union of faith and reason, nourished and guided by a living and tender charity. In his writings, preaching, and prayer, Fr. Clerissac strove to alleviate the spiritual afflictions of modernity. The Mystery of the Church embodies his best efforts and, although unfinished, stands as a testament to his love of Christ who is the Way, the Truth, and the Life, and his desire to share that love and its light for the salvation of souls.