"What's the River Styx," Reeve returned, because it meant as much to him as the Lifestream clearly did to him. "If you have not heard of the Lifestream, then by logic, this isn't the Lifestream. Which means I'm not dead. The lifestream is where the energy of all that lives returns when it passes, the very life force of Gaia. In the end it is one vast organism, and we are but a part of it. And the Lifestream is focused within Gaia, so if you don't know it, you aren't of Gaia."

To him it makes sense. It's just... well, it's an application of logic.

Which might be a bit hard to follow for others.