The basis of our service to God is given to us in this verse: "by the mercies of God..." This is the foundation for our worship, and indeed everything that we could ever be and do for the Lord. Praise the Lord, He could have done away with us and given us what we justly deserve, but He choose to extend to us His 'mercies.' In Luke 7:47b, I believe that Jesus taught a powerful principle of service (worship) [actually love] in relation to God's mercy - "...but to whom little is forgiven, the same loveth little." Dwight Moody said: "The more you know God, the more you'll love Him; the more you love Him, the more you'll serve Him better." And that is the truth. Serving God is the easiest thing to do when we stop and consider how truly sinful we are and how merciful God truly is.