how many different lives would we be leading if we made different choices

Mulder: I don’t think you can know. I mean, how many different lives would we be leading if we made different choices. We… we don’t know.
Scully: What if there was only one choice and all the other ones were wrong? And there were signs along the way to pay attention to.
Mulder: Mmm. And all the… choices would then lead to this very moment. One wrong turn, and… we wouldn’t be sitting here together. Well, that says a lot. That says a lot, a lot, a lot. That’s probably more than we should be getting into at this late hour.

X-Files S07E07