The first book of the Ethicon of Gregory Barhebraeus (d. 1286) contains a description of a number of ascetical practices such as the manner of saying prayers, reading spiritual books, reciting psalms, fasting, living in seclusion, pilgrimage, etc.. Barhebraeus' description is partly based on Greek and Syriac authors on the spiritual life. The originality of the work, however, lies in it being influenced by Islamic authors such as Al-Ghazali and B...