The fear of God is the first line of defense, keeping us from profaning God's name, tarnishing the image of the Lord, and defending us from pain and/or death.
We must have established some relationship with God before we can rightly fear Him. A holy fear is the key to unlocking the treasuries of salvation and wisdom.
Christ provides a model of how to live a godly life in the flesh, living life the way God lives it. Using His light, we can navigate our way in this world.