I think he means they're are both part of an inevitable interdependant experience. One that can be barely understood by the limitations of our consiousness. Examples being art, metaphysics and science, (this context) which are all still just concepts to measure with. So in a way, life and death end up kind of meaningless no matter what angle of comprehension you adopt. So why bother.

That's fine. The quote is from a person who gained god-like power and knowledge. The quote was a way to show that he could no longer relate to humans.

Then he went to Mars or the Moon (I forget which) and started creating life.