If your faith is rooted in the gospel of Zion, in the good news of Jesus’s life, death, and resurrection on your behalf, you are already a member of the “heavenly Jerusalem”
The opponents of Father Brown thought that debunking the fake resurrection of Father Brown would discredit the good news of Christ's resurrection. The truth, however, is the other way around.
We are the fruit that grows from the branch, which extends from the trunk of the tree, which is rooted in the soil that it grows out of, which is all Christ.