This enduring classic teaches the art of mental prayer as the path by which the saints drew near to God and grew in holiness. With clarity and depth, Rev. Edward Leen explains the essential elements of recollection, preparation, and perseverance, guiding readers from the first steps of meditation to deeper stages of contemplation. He addresses distractions, dryness, and common pitfalls while offering practical tools for sanctity, fruitful Communion, and intimacy with Christ. Rooted in sound spiritual theology, this book shows how faithful mental prayer renews the mind, strengthens virtue, and opens the soul to the transforming action of divine grace.