It must not be this way among Christians. Those who have honest and pious hearts should highly esteem their ministers and preachers in all humility and love, for the sake of Christ and of His Word. They should regard them highly as a gift and jewel given by God, more precious than any temporal treasure or possession. Similarly, true and pious preachers will faithfully seek only the welfare and the salvation of all people. They will not impose any burden on them, either in their consciences or even outwardly in their temporal possessions and physical existence. Whoever despises them should know that he is not a Christian and that he has lost the treasure once more. Our preaching and admonition is for everyone who will accept it and agree with us. Whoever refuses to do so and yet uses the name of the Gospel or the pretense of Christian brotherhood to despise us and to trample us underfoot, against him we use the art of letting him keep the pretense but actually taking everything back, so that he has nothing left at all. We have the command to separate ourselves from such people. We do not enjoy doing it, and we would have preferred to have them stay with us. But since they refuse, we must let them go and not let them ruin our treasure or trample it underfoot.  (Luther’s Works, v. 21, pages 228).