The Hidden Man of the Heart (I Peter 3:4). The Cultivation of the Heart in Orthodox Christian Anthropology. By Archimandrite Zacharias.

Softcover, 217 pages. 
Publisher: Mount Thabor Publishing, 2nd Edition, 2014. 
Size: 5 1/2" x 8 1/2"  
ISBN: 978-0-9800207-5-5