A. J. Jacobs: It’s all right. I miss my sin-free life, but I guess I was never sin free. I was able to cut down on my coveting maybe 40 percent, but I was still a coveter. Flat-screen TVs, the front yard of my friend in the suburbs, a better cell phone, higher Amazon rankings. And that's not to mention coveting my neighbor's wife. I live in New York, I work in publishing, so there’s a lot of coveting, lying and gossiping.

What, if any, rules are you still following? I’m not Ghandi or Angelina Jolie, but I made some strides. The experience changed me in big ways and small ways. There’s a lot about gratefulness in the Bible, and I would say I’m more thankful. I focus on the hundred little things that go right in a day, instead of the three or four things that go wrong. And I love the Sabbath. There’s something I really like about a forced day of rest. Also, during the experiment I wore a lot of white clothes, because Ecclesiastes says let your garments always be white, and I loved it, so I look like Tom Wolfe now. Wearing white just made me happier. I couldn’t be in a bad mood walking down the street looking like I was about to play in the semifinals at Wimbledon. One thing I learned is that the outside affects the inside, your behavior shapes your thoughts. I also really liked what one of my spiritual advisers said, which was that you can view life as a series of rights and entitlements, or a series of responsibilities. I like seeing my life as a series of responsibilities. It’s sort of, "Ask not what God can do for you, ask what you can do for God."

There seems to be a great interest in religion and fundamentalism in our culture right now. Why do you think that is?

As far as I can see it, it goes in waves. Now it seems like the third great awakening. Is that right? I’ve forgotten my encyclopedia knowledge. But I do think we’re going through a wave right now. You certainly see it with Islam. I think it’s ebbed a little bit because the atheist movement is creating backlash against the religious movement, so it might have peaked a year ago. But it’s certainly the defining issue of our time. I hope the book will appeal to both the sacred and the profane.