Time

Shoot. Lewis has a way of hitting things on the head. Here's another one of my problems exposed:

Now you will have noticed that nothing throws [this Christian] 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 tete-a-tete 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...

...If [God] appeared to him in bodily form and demanded that total service for even one day, he would not refuse. He would be greatly relieved if that one day involved nothing harder than listening to the conversation of a foolish woman; and he would be relieved almost to the pitch of disappointment if for one half-hour in that day [God] said 'Now you may go and amuse yourself.' Now if he thinks about his assumption for a moment, even he is bound to realize that he is actually in this situation every day.

-- The Screwtape Letters

C.S. Lewis

p. 111-113