"It is necessary for the soul that is going to ascend to the Divine to drive out from itself every sin committed through deeds, as well as whatever sins lie hidden in the soul, escaping the notice of those outside, but bitterly consuming man with most malicious fangs. Whose bones did the Lord scatter? Whom does the Lord abominate? 'The bloodthirsty and the deceitful the Lord abhors' (Psalm. 5:7)"
--St. Gregory of Nyssa, On the Christian Mode of Life, tr. by V.W. Callahan.