Philokalia
The Philokalia (Ancient Greek: φιλοκαλία, lit. 'love of the beautiful', from φιλία philia "love" and κάλλος kallos "beauty") is "a collection of texts written between the 4th and 15th centuries by spiritual masters" of the mystical hesychast tradition of the Eastern Orthodox Church. They were originally written for the guidance and instruction of monks in "the practice of the contemplative life".