These are spots in your love feasts, while they feast with you without fear, serving only themselves. They are clouds without water, carried about by the winds; late autumn trees without fruit, twice dead, pulled up by the roots; (Jude 12, NKJV)
Some believe it matters not what you teach, believe, and do to serve God, as long as you are sincere. Jesus taught differently (read Matt. 7:21-23). So did Jude in today’s verse. Jude warned Christians against false teachers, whose error corrupts the grace and destines them to destruction (Jude 4-11). Jude explains: 1) False teachers are spots (hidden reefs) in your love feasts. They are like unseen dangers lurching beneath the surface, ready to tear and to destroy those who venture into their waters (2 Pet. 2:1-2); 2) False teachers are deceptive. They often appear beautiful, attracting unsuspecting souls to take a closer look at their false ways. But, their beauty is deadly as they devour innocent souls (Matt. 7:15; 23:28; 2 Pet. 2:3). 3) False teachers are self-serving instead of fearful of God and sin (Phil. 3:18-19). Like empty clouds, they give no spiritual refreshment to the soul. They are fruitless and lifeless. Ignoring a false teacher and his false teaching is even more dangerous than a ship’s captain who ignores the reefs and rocks in the ocean. Hidden rocks can take a seaman to his death. When false teachers are hidden among us they take souls with them to eternal destruction (2 Pet. 2:1-3, 18-19). Oh yes, it matters what you teach, believe, and do in service to God (Heb. 12:28-29).