Paul Tillich, A History Of Christian Thought
Zwingli and Luther. Calvin. Predestination and Providence. Capitalism. Church and State.
We started discussing Zwingli, but my state of tiredness prevented me from giving a full account of him. I don’t want to go back to it, but I want to say that the interesting thing, in the first half of the Swiss Reformation, in Zurich where Zwingli was carrying it through, is that one could call it a synthesis of Reformation and humanism. When I say this, you remember that I spoke about Luther’s relationship to Erasmus and the final break, but the continuation of humanistic elements in the further Reformation on Lutheran soil, represented especially by Melanchthon. These two men, Zwingli and Melanchthon (“Melanchthon” from the Greek, meaning “black earth,”) Luther worked together with Melanchthon almost from the beginning of the Reformation, in Wittenberg (the theological wing which was dependent on him was often called Philippism) i.e. dependent on Philip Melanchthon, or “Blackearth,” if you want to retranslate him out of the nobly sounding Greek into less nobly sounding language! This man was deeply influenced by Erasmus, and never broke with him. Similarly with Zwingli. Both were Reformers insofar as they followed Luther. They were at the same time humanists insofar as they accepted elements coming from the master and leader of all humanism, Erasmus.
This was the difference between Luther and the Swiss reformers. When we come to Calvin, keep in mind that he is largely dependent on Zwingli, as well as on Luther, that he turns back to a certain extent from Zwingli to Luther, but in spite of all this he also was humanistically educated and in his writings shows the classical erudition in style and content.