Julius Köstlin,
Life of Luther
“ Luther, although he admitted having formed a more favourable opinion of Zwingli as a man, since their personal interview at Marburg, in no way altered his opinion of Zwinglianism or of the general tendency of his doctrines. Thus in a letter of warning sent by him in December 1532 to the burgomaster and town-council of Münster, he classed Zwingli with Münzer and other heads of the Anabaptists, as a band of fanatics whom God had judged, and pointed out that whoever once followed Zwingli, Münzer, or the Anabaptists, would very easily be seduced into rebellion and attacks on civil government. ”
