van Inwagen on the Origins of Human Rationality

From the fifth of his lectures on the problem of evil:
"It is not a discovery of evolutionary biology that there are no miraculous events in our evolutionary history. It could not be, any more than it could be a discovery of meteorology that the weather at Dunkirk during those fateful days in 1940 was not due to a specific and local divine action. Anyone who believes either that the coming-to-be of human rationality or the weather at Dunkirk had purely natural causes must believe this on philosophical, not scientific, grounds. In fact, the case for this is rather stronger in the matter of the genesis of rationality, for we know a lot about how the weather works, and we know that the rain clouds at Dunkirk are the sort of thing that could have had purely natural causes. We most assuredly do not know that rationality could have arisen through natural causes - or, at any rate, we do not know this unless we somehow know that everything in fact has purely natural causes. This is because everyone who believes that human rationality could have arisen from purely natural causes believes this solely on the basis of the following argument: Everything has purely natural causes; human beings are rational; hence, the rationality of human beings could have arisen from purely natural causes because it did so arise in fact."