books.google.co.uk - John Climacus (c. 579-649) was abbot of the monastery of Catherine on Mount Sinai. His Ladder was the most widely used handbook of the ascetical life in the ancient Greek Church....http://books.google.co.uk/books/about/The_Ladder_of_Divine_Ascent.html?id=HiTaxR0EU2MC&utm_source=gb-gplus-shareThe Ladder of Divine Ascent
