To Serve God is to Reign

"All-powerful God, to serve you is to reign: help us to serve you in holiness and justice. …" (Opening Prayer in the Mass of St. Casimir on March 4)

When I read the above prayer, I wanted to make sure I understand the meaning of the verb to reign and so I searched the Merriam Webster's Dictionary and found the following definition:

1 a : to possess or exercise sovereign power : rule b : to hold office as chief of state although possessing little governing power

2 : to exercise authority in the manner of a monarch
3 : to be predominant or prevalent

Is Jesus Christ not prophet, priest and king? Is it not our destiny to share in this royal dignity of the Son of God as adopted sons and daughters of God. To serve God is indeed to reign.