Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not just for the Orthodox

This book is surprisingly good. Brief pithy selections (1-2 pages in general) allow a busy person to dip in the book for inspiration. Anyone following a heart-centered path (Sacred Heart, Bodhisattva, Bhakti, etc.) and/or a path of continuous Interior Prayer will find much of value, clearly written and directly relevant. Complemented by something like "The Wisdom of the Desert" by Thomas Merton, it could get you ramped up to tackle the formidable Philokalia.