Today we have two short pieces to the gospel. In the first sentence Jesus tells the apostles he is to be handed over and killed by the Jews. In the second we are told the story of Jesus and Peter paying the temple tax.
For the early Christians, and for us, Jesus is the new temple, the place of worship. But to show that he is the continuation of the Old Testament, Matthew connects the two stories and shows Jesus as paying the temple tax even though he should be exempt from the tax.
I suppose that the second part is really about respect for our society, flawed and all as it is. Jesus cleared the temple of money changers and sellers but he still paid the tax. Our Church and our society both have their flaws and injustices yet we have to somehow try and work with the world as it is. Not easy at times!