Interior of the Basilica of St. John Lateran

“God himself in his loving mercy saw fit to make of us his own home. My fellow Christians, do we wish to celebrate joyfully the birth of this temple? Then let us not destroy the living temples of God in ourselves by works of evil. I shall speak clearly, so that all can understand. Whenever we come to church, we must prepare our hearts to be as beautiful as we expect this church to be. Do you wish to find this basilica immaculately clean? Then do not soil your soul with the filth of sins. Do you wish this basilica to be full of light? God too wishes that your soul be not in darkness, but that the light of good works shine in us, so that he who dwells in the heavens will be glorified. Just as you enter this church building, so God wishes to enter into your soul, for he promised: I shall live in them, I shall walk through their hearts. ~From a sermon by St Caesarius of Arles