When I first started reading my first few John Piper books (I'm up to around 25 now) I was completely blown away by his ability to get so much out of one verse. So much so, that I asked the leader of the theological course I was doing if this Piper guy was really 'kosher' - I couldn't believe that there was so much that I was missing.
Well I've decide to track with with the people at Bethlehem Baptist Church, Minnesota as he preaches through John's gospel for the next 30 years or so (slight exaggeration). In a sermon on John the Baptist John makes a massive point just out of the word 'not'. I kid you...not.