Today's reading is the letter of Jude. It warns that the greatest threat to the church is not from external opposition, but rather from within. There are people causing divisions in the church because they are misleading Christians by offering false teaching. Such false teaching is a sign of false belief (or no true belief at all), for which they will be punished. The letter offers several examples of God's punishment of people in the past, ranging from the Egyptians at the Red Sea to the troubled cities of Sodom and Gomorah. Everyone will receive God's judgment, including these false teachers; however, true Christians must focus on nurturing their own true faith, which includes both love and reliance on God's overwhelming mercy.