mirrors or windows

"Our churches naturally drift toward becoming like St. Catherine’s monastery: a fortified, doorless organization that focuses on its own preservation rather than its specific mission. Our hearts drift toward tribalism, the tendency to gather with people just like us and to reflect ourselves rather than the missionary heart of God. We’re always putting up mirrors around the light of the gospel when we should be putting up windows."
Trevin Wax, Counterfeit Gospels