When intelligence is unintelligible

I love this quote by William A. Dembski in his book, The Design Revolution. Writing about Darwinists who are skeptics of intelligent design, he says:
"Thus, for the skeptic, the world is intelligible only if it starts off without intelligence and then evolves intelligence. If it starts out with intelligence and evolves intelligence because of a prior intelligence, then, for the skeptic, the world becomes unintelligible." (William A. Demski, The Design Revolution, Downer's Grove, Illinois: InterVarsity Press, 2004, p. 202.)