"And whatsoever ye do, do it heartily, as to the Lord, and not unto men; knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ." Colossians 3:23-24

Duty - Serve as bond servants (Luke 17:10)
Dignity - Serve as ministers (John 12:26)
Devotion - Serve as sons (Hebrews 12:6-7,28)