John Calvin wrote tracts, he wrote the great Institutes, he wrote commentaries (on all the New Testament books except Revelation, plus the Pentateuch, Psalms, Isaiah and Joshua), he gave Biblical lectures (many of which were published as virtual commentaries) and he preached ten sermons every two weeks. But all of it was exposition of Scripture. Dillenberger said, "[Calvin] assumed that his whole theological labor was the exposition of Scripture" (see note 44). In his last will and testament he said, "I have endeavored, both in my sermons and also in my writings and commentaries, to preach the word purely and chastely, and faithfully to interpret His sacred Scriptures"
Calvin's preaching was of one kind from beginning to end: he preached steadily through book after book of the Bible. He never wavered from this approach to preaching for almost twenty-five years of ministry in St. Peter's church of Geneva - with the exception of a few high festivals and special occasions. "On Sunday he took always the New Testament, except for a few Psalms on Sunday afternoons. During the week . . . it was always the Old Testament". The records show fewer than half a dozen exceptions for the sake of the Christian year. He almost entirely ignored Christmas and Easter in the selection of his text.
"The Divine Majesty of the Word"