How to Disarm Sin: Analyze It

C.S. Lewis wrote in his autobiography:

You cannot hope and also think about hoping at the same moment; for in hope we look to hope's object and we interrupt this by (so to speak) turning round to look at the hope itself...The surest means of disarming an anger or a lust was to turn your attention from the girl or the insult and start examining the passion itself. The surest way of spoiling a pleasure was to start examining your satisfaction.

Analyzing sin suddenly makes the sinner loose his pleasure in that sin.