The intelligibility of the universe itself calls out for rational explanation and the idea that it is also limited to lower orders is irrational.
Kelly writes:
The very intelligibility of the universe leads any thinking person to a higher level above it to give rationality and consciousness their meaning. A rationality enclosed within the life and death cycle of limited nature would finally end in irrationality. Even to argue that life and the world are irrational requires the employment of rationality to frame such arguments. And similarly, to deny the existence of overarching good on the basis of the reality of evil requires the assumption of some supremely good standard by which one calls evil ‘evil’. The unique existence of the universe and of man within it cries out for a relationship with the Triune God who created all, in order to give it some meaning.