Blogger Tim Challies wrote a great piece on temptation. I recommend you read it.

I had an unusual and unexpected experience on Sunday—one that struck me as rather significant. I have been doing quite a bit of preaching at Grace Fellowship Church and elsewhere and knew that Sunday marked the last time I would have to prepare a fresh sermon until the end of the calendar year. Somehow this made me feel like I would be crossing a finish line when the service came to a close. It was a milestone I was looking forward to as it will allow me to focus on some other things for a while (good things, ministry things, but not preaching things).

I finished the sermon—quite an emotional and difficult one for me—and, after the service, was greeting people and then doing whatever else needs to be done at the close of a service. Very suddenly, and very unexpectedly, I was faced with a temptation to sin—to commit a sin to which I am particularly prone. I will not tell you what that sin is because I fear it would detract from what I am writing here. It could be envy or lust or fear of man or idolatry or any of the sins we find ourselves particularly drawn to. It is a sin for which I have experienced the Lord’s grace so that I am usually able to redirect my heart, at least in the moments that I am eager to honor God. And that is what I did. I saw the temptation to sin and immediately directed my heart to something better.

But then something happened. I don’t even know how this can happen, but in just a brief second, less than a second, a thought flashed through my mind. It was something like this: “Come on now. You’ve finished preaching, so go ahead and indulge. God won’t punish you now.” It stopped me dead in my tracks for a moment. It was an ugly thought and one that somehow seemed extrinisic to me. I truly don’t know where it came from. At least, I don’t think I’ve ever thought that before.

Read the rest of the article.