“But there are some fears that are rational. It’s reasonable to be afraid of murder, or to feel troubled about existing as a speck on a space rock floating in colossal, silent darkness. Those are rational fears. They’re both fears that can’t really be faced. How am I supposed to cope with fears like that? I thought the only option was to be delusional. I thought everyone coped by imagining reality isn’t what it is—by ignoring the threat of murder, or by forgetting we’re in space—or by doing what I do. By repeatedly exposing yourself until the threats feel familiar, the shock wears off, and you’ve conditioned yourself to find what scares you pacifying.”