A study done a few years ago showed that the first sign of incompetence is our inability to perceive incompetence. We deceive ourselves about our intelligence, for example. I may think I’m pretty smart until I read about a student who did not miss a single question on the SAT, ACT, and PSAT combined. We deceive ourselves about our talent, for people at a karaoke bar sing with far more confidence than reality would allow. We deceive ourselves about our appearance. A grandpa friend of mine boarded an airport tram and noticed an attractive young woman sitting nearby who smiled at him. He thought to himself, I’ve still got it. “Excuse me, sir,” she said. “I can stand. Would you like to take my seat?"
Nowhere does this inability to have an objective, accurate, reality-based view of our performance show itself more than in the spiritual realm. When it comes to moral character, the purity of heart, the duplicity in our actions, how many of us have given serious thought to how our lives would grade out -- in the eyes of a holy, just, righteous, and truth-telling God? That is why the most dangerous force in the world is not sickness or injury or bankruptcy.
It is sin.
-- John Ortberg in The Me I Want to Be