In his Jesus of Nazareth: From the Baptism in the Jordan to the Transfiguration, Pope Benedict XVI offers the following interpretation of the third temptation of Jesus in the wilderness (as recounted in Matt 4:8-10):
The Christian empire attempted at an early stage to use the faith in order to cement political unity. The Kingdom of Christ was now expected to take the form of a political kingdom and its splendor. The powerlessness of faith, the earthly powerlessness of Jesus Christ, was to be given the helping hand of political and military might. This temptation to use power to secure the faith has arisen again and again in varied forms throughout the centuries, and again and again faith has risked being suffocated in the embrace of power. The struggle for the freedom of the Church, the struggle to avoid identifying Jesus’ Kingdom with any political structure, is one that has to be fought century after century. For the fusion of faith and political power always comes at a price: faith becomes the servant of power and must bend to its criteria (39-40).
A bit later, Benedict concludes:
Jesus…repeats to us what he said in reply to Satan, what he said to Peter, and what he explained further to the disciples of Emmaus: No kingdom of this world is the Kingdom of God, the total condition of mankind’s salvation. Earthly kingdoms remain earthly human kingdoms, and anyone who claims to be able to establish the perfect world is the willing dupe of Satan and plays the world right into his hands (43-44).