Alcuin of York — as excerpted in the Catena Aurea on John 2:14-17

“To take the passage mystically, God enters His Church spiritually every day, and marks each one’s behaviour there. Let us be careful then, when we are in God’s Church, that we indulge not in stories, or jokes, or hatreds, or lusts, lest on a sudden He come and scourge us, and drive us out of His Church.”