From this we conclude, and the conclusion is inevitable, that just as being in the Roman unity does not make one a Christian, so being outside of that unity does not make one a heretic or unchristian. I should like to hear who would dispute this. For that which is essential must make a true Christian; but if it does not make a true Christian, it cannot be essential; just as it does not make me a true Christian to be at Wittenberg or to be at Leipzig. Now it is clear that external fellowship with the Roman communion[29] does not make men Christians, and so the lack of that fellowship certainly does not make a man a heretic or an apostate. Therefore it must also be false, that it is a divine command to be in connection with the Roman Church.[28] For whosoever keepeth one divine command, keepeth them all, and none can be kept without keeping the others[30]. Therefore it is an open and blasphemous lie against the Holy Ghost to say that the external unity under Roman authority is the fulfilment of a divine commandment, since there are so many in that unity who neither regard nor fulfil any of the Divine commandments. Hence, to be in this place or that, does not make a heretic: but to be without true faith makes a man a heretic. Again, it is clear that to be a member of the Roman communion[31] does not mean to be in true faith, and to be outside of it does not mean to be in unbelief; otherwise those within it would all be believers and truly saved, for no one article of faith is believed without all the other articles. Therefore all those who make the Christian communion[32] a material and outward thing, like other communities, are in reality Jews (for the Jews likewise wait for their Messiah to establish an external kingdom at a certain definite place, namely, Jerusalem), and thus sacrifice the faith, which alone makes the kingdom of Christ a thing spiritual and of the heart. [Sidenote: The Head of the Church] Again, if every temporal community is called after its head, and we say of this city, it is Electoral, and of that, it is Ducal, and of another, it is Frankish; then by right all Christendom should be called Roman, or Petrine, or Papal. But why, then, is it called Christendom? Why are we called Christians, if not from our head, although we are still upon earth? Hereby it is shown that for Christendom there is no other head, even upon earth, than Christ, for it has no other name than the name of Christ For this reason St. Luke tells us that the disciples were at first called Antiochians, but soon this was changed and they were called Christians. [Acts 11:26][33]