The really amazing thing is not that life on Earth is balanced on a knife-edge, but that the entire universe is balanced on a knife-edge. You see, even if you dismiss mankind as just a mere hiccup in the great scheme of things, the fact remains that the entire universe seems unreasonably suited to the existence of life — almost contrived — you might say a "put-up job".
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Notes from Wikiquote
Misquoted often: for example by Gerald Schroeder and by Dennis Prager in "Why Some Scientists Embrace the ‘Multiverse’: This universe’s evidence suggests a Designing Intelligence, so atheists resort to an idea with no evidence", National Review, 18 June 2013.