But when we refuse to serve any other than God through His word and wisdom, we do so, not as though we would thereby be doing any harm or injury to God, in the same way as injury would be done to a man by his servant entering into the service of another, but we fear that we ourselves should suffer harm by depriving ourselves of our portion in God, through which we live in the participation of the divine blessedness, and are imbued with that excellent spirit of adoption which in the sons of the heavenly Father cries, not with words, but with deep effect in the inmost heart, “Abba, Father.”
The Lacedæmonian ambassadors, when brought before the king of Persia, refused to prostrate themselves before him, when the attendants endeavoured to compel them to do so, out of respect for that which alone had authority and lordship over them, namely, the law of Lycurgus. But they who have a much greater and diviner embassy in “being ambassadors for Christ” should not worship any ruler among Persians, or Greeks or Egyptians, or of any nation whatever, even although their officers and ministers, demons and angels of the devil, should seek to compel them to do so, and should urge them to set at nought a law which is mightier than all the laws upon earth.
For the Lord of those who are “ambassadors for Christ” is Christ Himself, whose ambassadors they are, and who is “the Word, who was in the beginning, was with God, and was God.”
Source: Against Celsus (New Advent)