There are so many excellent thoughts, revelations, ideas in this post I have no idea where to start. So, instead of quoting anything, I will merely urge you to read this in its entirety.
I take it back. Here’s what may be my favorite part:
“An even more advanced civilization might view the entire physical world as a horribly primitive place, having long ago conquered their own biology and uploaded their brains to a virtual reality, eternal-life paradise. Living in the physical world of biology, mortality, wants, and needs might seem to them the way we view primitive ocean species living in the frigid, dark sea. FYI, thinking about another life form having bested mortality makes me incredibly jealous and upset.”