Ryle's Expository Thoughts on the Gospels: John 3

It is no light matter to publish an exposition of any book in the Bible. It is a peculiarly serious undertaking to attempt a Commentary on the Gospel of St. John. But I think every intelligent student of Scripture will bear me out when I say, that St. John’s Gospel is pre-eminently full of things “hard to be understood.” It abounds in “deep things of God,” and “sayings of the King,” which we feel instinctively we have no line to fully fathom, no mind to fully comprehend, no words to fully explain.