"For sometime now I have believed that it is our own force, all our own force that is still too great for us. It is true that we do not know it; but is it not just that which is most our own of which we know the least?"

"But then arises the doubt, can the mind of man, which has, as I fully believe been developed from a mind as low as that possessed by the lowest animal, be trusted when it draws such grand conclusions?"

"Natural science in England, as Darwin already knew to his cost, was still the purview of Christian scholars. But here was a question that Darwin found compelling: if God had created all the creatures of the world, what possible reason could there be for the variations found in the Galápagos?"

"A few years ago, the city council of Monza, Italy, barred pet owners from keeping goldfish in curved bowls... Saying that it is cruel to keep a fish in a bowl with curved sides because, gazing out, the fish would have a distorted view of reality. But how do we know we have the true, undistorted picture of reality?"