J. Gwyn Griffiths, The Divine Verdict: A Study of Divine Judgement in the Ancient Religions (Brill, 1991), passim, especially pp. 294–295 on Homeric, Platonic, and Vergilian views; pp. 313–322 online on confession, judgment, and forgiveness. Citations of ancient sources are those of Griffiths.
Richard Janko, “Forgetfulness in the Golden Tablets of Memory,” Classical Quarterly 34 (1984) 89–100; W.K.C. Guthrie, "The Future Life as Seen by Orpheus," in Orpheus and Greek Religion: A Study of the Orphic Movement (New York: Norton, 1966, revised edition), pp. 148–191 online.
