Matthew 16:1-4

Matthew 16:1-4
English Standard Version (ESV)

  Jesus is chiding us on what we pay attention to.  He's saying that the Pharisees and Sadducees can predict the weather based on what they see in the skies, but they're unable to predict what God might do next from reading the Prophets.  In summary, Jesus is reminding the Pharisees that everything about his life was predicted in the Old Testament, and that he is the fulfillment of so many prophecies, so they should believe in Him, because he is the long-awaited and predicted Savior.
  In the same way, we need to be reading the Scriptures because they teach us about how God works.  They illustrate how God has worked in the past, which should help us see how God is at work in the here and now. 
  If we spend all of our free time watching television, we're not going to learn about how God works.  But if we invest our time and energy into learning about how God has been and is at work in the world, if we pay attention to the right things, we may catch a glimpse of the Holy Spirit in action!