This is from my book Everything Must Change:
The cross is an even more dramatic narrative reversal. . . . Rome uses crosses to expose and pronounce a death sentence on rebels; Jesus uses the cross to expose Roman violence and religious complicity with it, while pronouncing a sentence of forgiveness on his crucifiers. His cross doesn’t represent a “shock and awe” display of power as Roman crucifixions were intended to do, but rather represents a “reverence and awe” display of God’s willingness to accept rejection and mistreatment, and then respond with forgiveness, reconciliation, and resurrection. In this kingdom, peace is not made and kept through the shedding of the blood of enemies, but the king himself sacrifices his blood to make a new kind of peace, offering amnesty to repentant rebels and open borders to needy immigrants.
If, as Dominic Crossan says, the Roman motto is peace through victory, or peace through the destruction of enemies, or peace through domination . . . then for Jesus the motto is peace through nonviolent justice, peace through the forgiveness of enemies, peace through reconciliation, peace through embrace and grace. If in the violent narratives of Rome the victorious are blessed – which means that the most heavily armed, the most willing to kill, and the most aggressive and dominant are blessed – then in the framing story of the kingdom of God, blessed are the meek, blessed are those who hunger and thirst for justice, blessed are the peacemakers, and blessed are those who are willing to suffer for doing good. In this light, these aren’t simply greeting-card sentiments, but rather ways of starkly contrasting Jesus’ framing story with the narratives and counternarratives of his day.
– Brian McLaren in Everything Must Change