Luke 11 - Scary

"Woe to you experts in the law, because you have taken away the key to knowledge. You yourselves have not entered, and you have hindered those who were entering."

The scary part is when you consider that these guys didn't know they were doing this. They thought they were right, just like Saul before Jesus called him out. We sometimes meet people and they are so sure they have the "key to knowledge" that we think they must. The truth is they can be completely wrong. Certainty does not equal correctness.