It’s interesting to look at (compare & contrast) the responses of the action’s / reactions between Jesus, the disciples, and the Pharisees. I’d say that by this time many of the Pharisees are getting a little fed up with Jesus. So they decide that they are going to respond to Him by testing Him. They ask Jesus for a sign that He is who He says He is. Of course you know that Jesus is not going to just make things easy for them. He already knows what’s in their hearts, so He criticizes them for not seeing (or ignoring) the signs that are there right in front of them.
So Jesus, understanding the Pharisees, turns around later and tells His disciples to beware of the leaven (teachings) of the Pharisees. They don’t get it at first, but after some prompting, they catch on. So Jesus finally comes to them and asks them about their response to who He is. Peter is the only one who seems to give a real and solid response. He tells Jesus, “You are the Christ, the Son of the living God.” Jesus response is high praise of Peter.
So now, because of the response He is given, Christ begins to put a little more depth / meat into His teachings. He foretells His death and explains the cost of following Him. Of course we know how the (hi)story goes, but they didn’t at that time.
I wanted to touch on Peter’s “good’ confession here as it has some very interesting facets. I love the play on words that Jesus does here. Peter says to Jesus, “You are the Christ (Kristos) the Son of the Living God.” Jesus responds that this is not something that Peter discovered, but rather something that was revealed to him by the Father. It’s what Jesus says that is so interesting: “I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it.” The name Peter is the Greek word “petros”. It means a small stone. The picture that i get here is of a rock that you would use to skip on a pond. The word “rock” in this verse is “Petra” which means a very large rock, a bedrock, or a foundational stone. So we have Jesus telling Peter, “You are a small stone, and on this huge froundational stone I will build my church, and the gates of Hell will on overtake it.
So if the foundational stone is not Peter, then what is it? It is this truth; “You are the Christ, the Son of the living God.” This is such an amazing picture, because out of the small stone, the pebble if you will, comes the bedrock of truth. The pebble speaks forth the mountain. Isn’t that an amazing picture?! The pebble is not the foundation / mountain, but out of the small stone / pebble comes that which is the foundation / mountain. It is an amazing picture!