Yanek: The thing of it is mankind has existed in a state of tension since the beginning of time. Between what is and what could be. There's a truth, too, that we can't deny.
Howard A: What truth?
Yanek: That any man may see himself as ordinary, but confront him with another version of his life and the one destroys the other. It's inevitable.
Howard A: I don't believe that.
Yanek: Your other is out there right now erasing you from your own existence.
Howard A: You don't know that.
Yanek: If it's occurred to you, it's occurred to him, and it has occurred to you, hasn't it? You are a gentle man, and this is war.