Ambrose of Milan — as excerpted in the Catena Aurea on Luke 11:37-44

“Now mark that our bodies are signified by the mention of earthly and fragile things, which when let fall a short distance are broken to pieces, and those things which the mind meditates within, it easily expresses through the senses and actions of the body, just as those things which the cup contains within make a glitter without. Hence also hereafter, by the word cup doubtless the passion of the body is spoken of. You perceive then, that not the outside of the cup and platter defiles us, but the inner parts. For he said, But your inward part is full of ravening and wickedness.”