SEBASTIAN BROCK FBA is one of the foremost scholars in the field of Syriac studies. He is emeritus Reader in Syriac Studies in the University of Oxford, and an emeritus Fellow of Wolfson College, Oxford. He has published over 600 articles and books, including thirty about St Isaac. Among his publications are The Syriac Fathers on Prayer and the Spiritual Life (Cistercian Publications, 1987), Isaac of Nineveh (Isaac the Syrian): ‘The Second Part’, Chapters IV–XLI (Peeters, 1995) and Isaac of Nineveh: Headings on Spiritual Knowledge (St Vladimir’s Seminary Press, 2022).