The Art of Prayer - An Orthodox Anthology
This was the book that introduced me to St. Theophan the Recluse, and that prompted me to embark on the path of Orthodox Christianity. It is a kind of "prayer manual," compiled by the abbott ("igumen") of a revered Orthodox monastery who collected his favorite writings on the interior life, those he felt would be most helpful for his monks. The very great majority of these writings were from letters of spiritual direction written by St. Theophan the Recluse. I love this book!
The Art of Prayer - An Orthodox Anthology, Igumen Chariton of Valamo, compiler, Faber and Faber, London, 1997.
Unseen Warfare
Bishop Theophan the Recluse, a director of souls and an ascetic theologian of note, who was acquainted with Nicodemus' writings, was moved by his admiration of them to translate the Unseen Warfare from Greek into Russian. Like Nicodemus, and on an even greater scale, he allowed himself in translating it to make various changes and adaptations. The resulting version, supported by the double authority of Nicodemus and Theophan, took an assured place in the spiritual literature of the Russian Church. [From the Introduction to the book.]
The title, in our mostly Protestant culture, is potentially somewhat misleading. It's a wonderful manual on the inner life.
Unseen Warfare - as edited by Nicodemus of the Holy Mountain and revised by Theophan the Recluse, St. Vladimir's Seminary Press, Crestwood, NY 2000.