Peter of Damaskos

It is a great blessing from God that some parts of the Scriptures are clear while others are not. By means of the first we acquire faith and ardour and do not fall into disbelief and laziness because of our utter inability to grasp what is said. By means of the second we are roused to enquiry and effort, thus both strengthening our understanding and learning humility from the fact that everything is not intelligible to us.