Today's readings from the Roman Catholic liturgy brought home something I've been thinking about for the past couple days. Here's what Jesus said in Matthew 7:
Hear me, all of you, and understand. Nothing that enters one from outside can defile that person; but the things that come out from within are what defile.
From within people, from their hearts, come evil thoughts, unchastity, theft, murder, adultery, greed, malice, deceit, licentiousness, envy, blasphemy, arrogance, folly. All these evils come from within and they defile.