God has made enough of His Word so crystal clear that only blind and blatant disbelief will not understand.
He has made enough of His Word so deep that even the most faithful must depend on His enlightenment, rather than intellect. (Taken from Beginning at Moses, p. 5)
Or, as Gregory the Great once said:
The Bible is like a stream of running water in which a lamb may walk and an elephant may swim.
Praise God that His Word can be grasped by any simple student, but will never be exhausted by any studied scholar.