[9.] “Lest any of you,” he says, “be hardened by the deceitfulness of sin.” He means either the deceit of the devil (for it is indeed a deceit, not to look for the things to come, to think that we are without responsibility, and that we shall not pay the penalty for our deeds here, neither will there be a resurrection); or in another sense insensibility [or] despairing is deceit. For to say, ‘What is there left? I have sinned once for all, I have no hope of recovering myself,’ is deceit.