When today’s Feast falls on a Sunday, the USCCB puts aside the expected Sunday Liturgy to celebrate it. So, the Church must think that there is something very important about this Feast. The Lateran Basilica is the home parish for the Bishop of Rome, the Pope. His cathedra, chair, is there. So, that makes the Lateran Basilica the mother Church of all the Churches in the Catholic world. It, like the Pope, is an outward sign of our unity. But, there has to be something more. I think that something more is a reminder that we, you and I, are the Church. We are the Temple of God, we are “living stones” that make up God’s Church. This Feast, then, reminds us of who we are and to Whom we belong.