Tana French

I've got this theory that human beings are innately religious; we have a belief system. It doesn't have to be a theist form, necessarily. But we need a belief system, some framework on which to hang our behavior.

If you're writing a scene for a character with whom you disagree in every way, you still need to show how that character is absolutely justified in his or her own mind, or the scene will come across as being about the author's views rather than about the character's.