[asa] Polkinghorne quote on time required for the evolutionary process

I remember seeing a quote by Polkinghorne to the effect that it mystified
him how evolutionary biologists were so confident in their account of the
development of life on earth. How could they be so sure that 3.5 billion
years was enough for the evolutionary process to explain the development of
single celled organisms all the way up to the current state of terrestrial
diversity? As a physicist and a bottom up thinker, he felt that more
detailed calculations should be provided before conclusions were so
confidently proposed. (I'm pretty sure he closed the paragraph saying he
trusted the evolutionary biologists anyways).

My question: Does anyone know where this quote is from? I'm skimmed through
a couple of Polkinghorne books now and can't seem to find it.

-- 
Steve Martin (CSCA)
http://evanevodialogue.blogspot.com
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