It's a kind of mystical-sounding nonsense that turned out to be true, as far as Peter knows. He can understand why not everyone would believe it.

"Well...no. We have our needs meet and, technically, we're all here because we decided to answer to that voice in our heads and agree to help. I don't know if you can leave if you try really hard to think about going back to your world, or something. No one's done that before, but I've only been here for a couple of months and besides...I have a reason to say here."

The same reason he had for accepting to be part of the station. To help Gamora, to fix what happened and hopefully find her again. And now, only a few days ago, she showed up herself at the station.

"I don't know what would happen if I leave. It could be the wrong choice."