Can't You Hear Me Gnostic: John Lash, The Man and The Message
John Lamb Lash recovered the teaching of the Mystery schools of antiquity through researching old texts and the relevant Gnostic material buried the the Judeo-Christian-Gnostic mix of writings called the Nag Hammadi Library. His book "Not In His Image" covers that discovery and the restored Sophianic Narrative of these schools.