Zack Ford has the quote at Think Progress:
Here’s what we know about life. I have all kinds of natural feelings in my life and it doesn’t necessarily mean that I should act on every feeling. Sometimes I get angry and I feel like punching a guy in the nose. It doesn’t mean I act on it. Sometimes I feel attracted to women who are not my wife. I don’t act on it. Just because I have a feeling doesn’t make it right. Not everything natural is good for me. Arsenic is natural.
Zack also has a list of Rick Warren’s long history of anti-gay douchebaggery.