"It's like the one friend, I guess, that he has in the world. I heard a phrase once, somebody was talking about his wife. This was a person who was very inept socially. There were many things said about him that weren't kind, and he said, 'My wife, who is lovely and social and everything like that, is my human credential.' And, like, makes him a human being, because people think, well, if *she* can stand him, he must have some humanity within him and sometimes I think about Scully as Mulder's human credential.
It's the only thing that makes him not crazy in many ways."
musings of David Duchovny