Ever get called to the principal's office in school? What about being called into your supervisor's office at work? Did you at least get a bit afraid at the thought of it?
We should have a healthy fear or reverence of the Lord as well. The Bible says in Proverbs 9:10 "The fear of the LORD is the beginning of wisdom: and the knowledge of the holy is understanding." Remember: Matthew 12:36 "But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment."
EVERY idle word. Wow, have you ever mumbled something under your breath towards someone who upset you or fussed at another driver on the road? Think about that one for a while!