Jesus' assignment was to reveal the Father. One of the ways he does this was to show the purpose of the Temple. He said that this was His Father´s house. This shows the purpose of the father. It also shows that we humans easily change the purpose from centering on the Father to become a center of commerce.
The following sermons talks about what Jesus revealed about the Father when He found the Temple was used for the wrong thing.
Follow this link to hear the sermon.Our Father´s House John 2:13-17