NOTES for Luk 9:49-56
It is striking that Christ's disciples, until His very Resurrection from the dead, are held captive by common Jewish ideas. Faced with the Samaritans' refusal to receive Him, they are already ready to pray for fire from heaven and cite the prophet Elijah as an example to imitate.
It must be admitted that for many Christians over the centuries such a form of preaching appeared optimal. In one empire, a special theological theory was even devised according to which the emperor had to be converted to Christianity, and then by fire and sword he would conquer the whole world and drive all subject peoples into the faith. Everything would have been fine; it is only a pity that the empire fell before it managed to fulfill the mission laid upon it.
Christ's words in response to this strange thought of the disciples are simple and stern: "You do not know what spirit you are of". Though empires nowadays seem to have disappeared (perhaps fortunately), this temptation, and this rebuke by Christ of our inclination to violence, remain very important in the lives of individual people as well. It is not fitting to defend truth by force, because Truth conquers on the Cross.