Why a Rock? A Sermon on Matthew 16:13-20

July 29, 2025

A sermon given at an all-age service at the wonderful church of St Wilfrid's, Calverley, on June 29th. The reading was Matthew 16:13-20: it was fun to work the film Labyrinth into a sermon on a very well-known text!

This is the full text of the reading (plus a little extra, because the story is best heard with it in):


13 Now when Jesus came into the district of Caesarea Philippi, he asked his disciples, ‘Who do people say that the Son of Man is?’ 14 And they said, ‘Some say John the Baptist, but others Elijah, and still others Jeremiah or one of the prophets.’ 15 He said to them, ‘But who do you say that I am?’ 16 Simon Peter answered, ‘You are the Messiah, the Son of the living God.’ 17 And Jesus answered him, ‘Blessed are you, Simon son of Jonah! For flesh and blood has not revealed this to you, but my Father in heaven. 18 And I tell you, you are Peter, and on this rock[e] I will build my church, and the gates of Hades will not prevail against it. 19 I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.’ 20 Then he sternly ordered the disciples not to tell anyone that he was[f] the Messiah.


21 From that time on, Jesus began to show his disciples that he must go to Jerusalem and undergo great suffering at the hands of the elders and chief priests and scribes, and be killed, and on the third day be raised. 22 And Peter took him aside and began to rebuke him, saying, ‘God forbid it, Lord! This must never happen to you.’ 23 But he turned and said to Peter, ‘Get behind me, Satan! You are a stumbling-block to me; for you are setting your mind not on divine things but on human things.’


******


Photo by Nestoras Argiris on Unsplash

By Suse McBay April 14, 2026
A few weeks ago, I got to sit down via the wonders of the internet and have a catch-up with my friend and former colleague, Wayne Watson. We talked God, life, and the universe. And Winnie the Pooh! In Wayne's own words " What begins as lighthearted conversation between old friends quickly unfolds into a thoughtful and wide-ranging exploration of culture and the pursuit of God's truth. " It was fun. If you fancy a listen, check out the podcast (and the entire series) by clicking here ! ******
deute
By Suse McBay April 8, 2026
***** I’ve long noticed that the Bible that gets preached from the Sunday pulpit can be, well, a bit picky. Some bits are kept in and preached. Others are studiously ignored. The result? Different churches can give quite a different sense of what the Bible's message is than if you actually read it through cover to cover. Now I don't mean to accuse any one wing of the church: whether your tradition uses the lectionary (usually a three-year cycle of curated readings) or jumps around the canon to whichever biblical book or theme is of interest, certain parts of the Scriptures are often ignored. Some passages are cut off halfway through; others are omitted entirely. I remember preaching on Independence Day in the US (the irony of doing so as a Brit was not lost on me). The reading for the day began in Deuteronomy 10:17: “For the LORD your God is God of gods and Lord of lords, the great God, mighty and awesome, who is not partial and takes no bribe, who executes justice for the orphan and the widow, and who loves the stranger, providing them food and clothing…” Sounds lovely, right? Well, yes—but Deuteronomy 10:17 starts in the middle of a paragraph. In the middle of divine instruction that God gives through Moses. We can see this in how it begins: for the LORD your God.. . It could also be translated because the LORD your God … This passage is the explanation for something. It is a why to a biblical command, not a standalone theological statement. So what’s the actual command? What’s the main message God wants the people to hear? The verse before (v.16) says this: “Circumcise, then, the foreskin of your heart, and do not be stubborn any longer.” The purpose of this speech? To call God’s people to repentance. To change. The ‘heart’ in biblical texts usually refers to one’s innermost self. The seat of who you are in the deepest places of your will and desire. God has said he wants their obedience (v.12), he has reminded them of his extraordinary generosity in choosing them as his people (vv.13–15), but here God lands a punch: The centremost part of who you are, God says, needs to be clipped. Reading vv.17–22 feels quite different in light of the whole text. It’s not a statement of a good God whom we should simply ‘fear’ and ‘hold fast to’ (v.20). It’s far more rooted and real than that. In reading through all ten verses, we get a sense of a people who have become too big for their boots. Who have forgotten that it’s not because they have anything to offer that God chose them, but rather because of the graciousness of God. And we get a clear call from God that such people need to, in essence, sort themselves out. Be humbled. Circumcise their hearts. I don’t believe the Sunday lectionary was formed with a conspiratorial agenda to omit the hard stuff (the whole thing would largely be read through in the daily lectionary for the Daily Office). But I do believe it’s spiritually dangerous for us to ignore the material that is left on the cutting room floor in our preaching. The people of God are called to grow into the fullness of the gospel—to become mature Christians. If we only ever swim in the protected waters of the lectionary, we will not be confronted by the reality of a God who regularly and reliably calls his people to humble themselves, care for those in need, and live lives of sacrificial love. Who makes space within their communities for the vulnerable. Who looks out for the marginalised among us. Who deals with the darkest and ugliest of human evil. Who redeems out of family lines and dynasties most of us would give up on. In recent years, there has been increasing focus on the importance of the gut–brain connection. How what you eat shapes who you are, and how you function mentally, emotionally, and physically. What we fuel ourselves with matters. The same is true spiritually. The Bible is the spiritual equivalent of a Whole30. Or a wholemeal, organic, seed-infused sourdough loaf. It’s nutritious and gritty. It requires some chewing. It’s not always easy to digest. But it provides the minerals and nutrients we need. It may take some adjustment, but it may also be just what the doctor ordered. Not for our physical sicknesses, but rather our more pernicious spiritual malaise. ******

Join us in Oxford in 2025!

Subscribe to

My Newsletter

Sign up here to receive quarterly updates (and occasional other news blasts) about how ministry is going and our move to the U.K.