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.
This is the general character of the Swiss Reformation, in contrast to the Lutheran. I believe that whenever liberal theology arises, as it did from the 17th to the 19th centuries, that since that time theologians develop in all denominations who are nearer to Zwingli than to Calvin. One of the main points I made is that Zwingli believes that the Spirit is directly working in the human soul and that therefore God’s ordinary working goes through the Word, the Biblical message, but that God, extraordinarily, can also work on people who never had contact with the Christian message with people whom we speak of as living in foreign religions, or the humanists. The examples given by Zwingli are mostly from Greek philosophers, such as Socrates, and others.