This introduction to Gnosis by Christoph Markschies combines great clarity with immense learning.In his Introduction Markschies defines the term Gnosis and its relationship to 'Gnosticism', indicating why Gnosis is preferable and sketches out the main problems. He then treats the sources, both those in the church fathers and heresiologists, and the more recent Nag Hammadi finds. He goes on to discuss early forms of 'Gnosis' in antiquity, Jewish...