Oh well, you can't please everyone!

Part 3 "In the teeth of these stupefying odds it is you and I, in our ordinariness, that are here.We privileged few, who won the lottery of birth against all odds, how dare we whine at our inevitable return to that prior state from which the vast majority have never stirred?"

Part 2 "Certainly those unborn ghosts include greater poets than Keats, scientists greater than Newton. We know this because the set of possible people allowed by our DNA so massively exceeds the set of actual people."

Lookup the whole quote, it's in his book Unweaving the Rainbow. Sadly the character limit was a factor here.