Men are not angered by mere misfortune but by misfortune conceived as injury.... Now you will have noticed that nothing throws him into a passion so easily as to find a tract of time which he reckoned on having at his own disposal unexpectedly taken from him. It is the unexpected visitor (when he looked forward to a quiet evening), or the friend’s talkative wife (turning up when he looked forward to a tête-a -tête with the friend), that throw him out of gear. Now he is not yet so uncharitable or slothful that these small demands on his courtesy are in themselves too much for it. They anger him because he regards his time as his own and feels that it is being stolen. You must therefore zealously guard in his mind the curious assumption ‘My time is my own’. Let him have the feeling that he starts each day as the lawful possessor of twenty-four hours. Let him feel as a grievous tax that portion of this property which he has to make over to his employers, and as a generous donation that further portion which he allows to religious duties. But what he must never be permitted to doubt is that the total from which these deductions have been made was, in some mysterious sense, his own personal birthright.
You have here a delicate task. The assumption which you want him to go on making is so absurd that, if once it is questioned, even we cannot find a shred of argument in its defence. The man can neither make, nor retain, one moment of time; it all comes to him by pure gift; he might as well regard the sun and moon as his chattels....
When I speak of preserving this assumption in his mind, therefore, the last thing I mean you to do is to furnish him with arguments in its defence. There aren’t any. Your task is purely negative. Don’t let his thoughts come anywhere near it. Wrap a darkness about it, and in the centre of that darkness let his sense of ownership-in-Time lie silent, uninspected, and operative.
Your affectionate uncle,
C.S. Lewis, The Screwtape Letters (originally 1942; this edition: Harper Collins, 1996) 111-113.