We exist as parts in a grand system: the Universe, a continuum which has been in motion for billions of years. We exist as but the briefest of instants in the grand cosmic scale of this continuum.
Though all of us unique, we share so much from our close progenitors. We are all the same. We are skin and bone and blood. We bleed and cry and laugh, though some of us have forgotten how.
In Carl Sagan's stirring, enchanting words,
It will not be we who reach Alpha Centauri, and the other nearby stars. It will be a species very like us — but with more of our strengths and fewer of our weaknesses.
I'm envious of those palimpsestic humans who come after me, of those who will experience the benefits of the future. They will be better than us, but they also depend on us. Though we exist so briefly in this continuum, we are the ones making the world in which they will live.