T. H. Huxley

The known is finite, the unknown is infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to claim a little more land.

I have never been able to understand why pigeon-shooting at Hurlingham should be refined and polite while a rat-killing match in Whitechapel is low.

Science is simply common sense at its best - that is rigidly accurate in observation and merciless to fallacy in logic.