I have committed many sins in my life. Not one of my sins has ever made me happy. None has ever added a single ounce of happiness to my life. Quite the contrary. Sin has added an abundance of unhappiness to my life. I stand amazed at those famous personalities who, in the course of television or magazine interviews, declare that if they had their lives to live over, they would do nothing differently. Such foolishness staggers my imagination. There are multitudes of things I would love to have the chance to do over. Now it is quite possible that with a second chance, I would make the same foolish mistakes, but I’d still like the chance to try.

My sins have not brought me happiness. But my sins have brought me pleasure. I like pleasure. I am still very much attracted to pleasure. Pleasure can be great fun. And not all pleasures are sins. There is much pleasure to be found in righteousness. But the difference is still there. Sin can be pleasurable, but it never brings happiness.

Now if I understand all this, why would I ever be tempted to sin? It seems silly that anyone who knows the difference between happiness and pleasure would continue to trade happiness for pleasure. It seems utterly stupid for a person to do something that he knows will rob him of his happiness. Yet we do it. The mystery of sin is not only that it is wicked and destructive but also that it is so downright stupid.

I smoked cigarettes for years. I never really kept count, but my guess is that during those years, hundreds of people called my attention to the fact that smoking was not a good thing for me to be doing. They were merely pointing out to me the obvious, telling me what every smoker in America already knows. Before I was ever converted to Christianity, I knew full well that smoking was harmful to me. I knew it before the surgeon general ever put a warning label on cigarette packages. I knew it from the first cigarette I ever smoked. Yet I continued to do it. Sheer madness. That is what sin is.

R.C. Sproul, The Holiness of God (Kindle edition, location 1615)