Why I realize I *have* to read Ronald Knox. :-)
From Second Friends: C.S. Lewis and Ronald Knox in Conversation by Milton Wash (p. 57):
...Can the philosophy of materialism explain the existence of intelligence? [Bertrand] Russell believes it can: given the vastness and complexity of the universe, it is probable that among the various combinations you will have one or two that produce intelligent organisms. This, for Knox obfuscates the question: "If the police were to discover a human body in Mr. Russell's Saratoga trunk, he would not be able to satisfy them with the explanation that, among all the innumerable articles of luggage in the world, it is only natural that there should be some few which are large enough to contain a body. They would want to know how it got there." By airily talking of hypothetical possibilities in a vast universe, Russell is avoiding the question of how in fact our material world has produced the spiritual reality of intellect. The existence of something different from the material world requires a cause that is other than material, and points to a Mind which is the source of our human ability to reason.