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"Is it still God speaking when a liar or blasphemer speaks? In one sense, almost yes. Apart from God he could not speak at all; there are no words not derived from the Word; no acts not derived from Him who is Actus purus. And indeed the only way in which I can make real to myself what theology teaches about the heinousness of sin is to remember that every sin is the distortion of an energy breathed into us - an energy which, if not thus distorted, would have blossomed into one of those holy acts whereof "God did it" and "I did it" are both true descriptions. We poison the wine as He decants it into us; murder a melody He would play with us as the instrument. We caricature the self-portrait He would paint. Hence all sin, whatever else it is, is sacrilege."
My full review of Letters to Malcolm will post on Friday.