Sins of the Mind

Σοὶ μόνῳ ἥμαρτον καὶ τὸ πονηρὸν ἐνώπιόν σου ἐποίησα. Κατ' ἐνέργειαν ἁμαρτάνοντες, καὶ ἀνθρώποις καὶ Θεῷ ἁμαρτάνομεν· κατὰ δὲ διάνοιαν πλημμελοῦντες Θεῷ μόνῳ ἐξαμαρτάνομεν. Ἡ ἀντὶ τοῦ, Σοι μόνῳ ἔγνωσται τὸ ἡμαρτημένον. Ὠριγένης, Εἰς Ψαλμους, Ψαλμος Η'

Against you alone I have sinned and done wickedness in your sight.  1 When we sin in deed, we sin against men and God; when in the mind we err, against God alone we sin. Which is to say, 'To you alone is known my sin.' Origen, On the Psalms, from Psalm 50 1 Ps 50.6