Once we have experienced the grace of God, we need to share that grace with others.  Christian action is our response to God's grace.  We become the hands and feet of God sharing the light of Christ to a world lost in the darkness.

“You are the light of the world. A city that is set on a hill cannot be hidden.  Nor do they light a lamp and put it under a basket, but on a lampstand, and it gives light to all who are in the house.   Let your light so shine before men, that they may see your good works and glorify your Father in heaven."  Matthew 5:14-16 NKJV