A Christian is not simply someone who has accepted Jesus into their life, received their ‘salvation ticket’ which they can one day present at the pearly gates. A Christian is one who not only receives individual salvation by confessing Christ as saviour, but is one who accepts the Lordship of the triune God. . He simultaneously confesses the kingdom and walks in the way of the kingdom. A person lives in a kingdom under the authority of the king. A Christian lives under the triune God’s ethic and laws. Antinomian theology is an enemy to the church for the way of Christ means submission to the ethic and law of Christ.
In 2 Macc 7 we read of the Maccabean martyrs who were willing to suffer loss of limbs and life for the sake of establishing the reign of God. The enemy for the Maccabean martyrs was the pagan overlords. Jesus no doubt knew of these heroic stories as they were burned in the folk memories of 2nd temple Jews. However, for Jesus, the disciple is to look inwards as well as outwards for the presence of the enemy. Some Jews looked to Rome as the enemy of the kingdom, Jesus challenges his desciples to look at their own lives.
The extended warning of vv. 43–48 picks up the theme of ‘tripping’ from v. 42, but the victim is not now someone else (a ‘little one’) but oneself, ‘tripped’ by one’s own hand, foot, or eye. Danger comes to the disciple not only from outside but from within
France, R. T.: The Gospel of Mark : A Commentary on the Greek Text. Grand Rapids, Mich.; Carlisle : W.B. Eerdmans; Paternoster Press, 2002, S. 382
Once again the boundaries between insiders and outsiders have been blurred. ….urthermore, those who are confident of their status as insiders may put themselves outside by their treatment of weak believers or by self-indulgent behavior.
Dowd, Sharyn Echols: Reading Mark : A Literary and Theological Commentary on the Second Gospel. Macon, Ga. : Smyth & Helwys Publishing, 2000 (Reading the New Testament Series), S. 98
It is easy to look at the enemy outside of oneself or outside of the community. In the west the enemy used to be Nazism, then Communism, and now Islamic extremism. However much these ideologies can be critiqued we must not be immune to looking without our hearts to see the enemy. As someone once said when talking about evil ‘The heart of the matter is the problem of the human heart’.