When kingdom-of-God citizens aspire to acquire Caesar’s authority to accomplish “the good,” we sell our kingdom birthright for a bowl of worldly porridge (Gen. 25:29-34). To the extent that we pick up the sword, we put down the cross. When our goal as kingdom people becomes centered on effectively running a better (let alone Christian) version of the kingdom of the world, we compromise to be faithful to the kingdom of God.

Gregory A. "Greg" Boyd (b. 1957) American evangelical pastor, Christian theologian, author.

The Myth of a Christian Nation (2007)