When I think of dullness, I’m quickly reminded of living in a lukewarm way. Lukewarm is good for a baby’s bath, but not recommended for living. Jesus asks if we are “still so dull?” Does that describe you? I hope not. Read the context to see if you qualify.
Matthew 15:13-20 (NIV)
15 Peter said, “Explain the parable to us.”
16“Are you still so dull?” Jesus asked them.
17“Don’t you see that whatever enters the mouth goes into the stomach and then out of the body?
18 But the things that come out of the mouth come from the heart, and these make a man ‘unclean.’
19 For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false testimony, slander.
20 These are what make a man ‘unclean’; but eating with unwashed hands does not make him ‘unclean.'”