The notion of guerrillas seems to be rooted in the ancient Judeao-Christian tradition. The Old Testament prophets can easily be conceived of as guerilllas doing battle with the established powers of their day; and their thundering, poetic words and images can be read as forms of prayer. Certainly Jesus was the pre-eminent guerilla of grace; he confronted repressive institutions and liberated captive minds and hearts with his words and his life. A prime weapon in his effort was prayer, and it was little wonder that he taught his disciples to pray. . . .
Guerrillas, then, are engaged in the battle to reclaim some territory, or some part of life, for a higher purpose, a truer cause. To wed guerilla with grace suggests that the truer cause is God's kingdom.
— Ted Loder, Guerrillas of Grace