A philosopher is a blind man in a dark room looking for a black cat that isn't there. A theologian is the man who finds it.

I recall the story of the philosopher and the theologian... The two were engaged in disputation and the theologian used the old quip about a philosopher resembling a blind man, in a dark room, looking for a black cat — which wasn't there. ‘That may be,’ said the philosopher, ‘but a theologian would have found it.