“Calvin preached without notes and, it would seem, direct from his Hebrew Old and Greek New Testament. He had little time for immediate preparation, but his close knowledge of the Bible and his wide reading stood always at the command of his memory. Moreover, he had, after all, written commentaries on many of the books he was expounding. Perhaps all his preparation was to refresh his mind and give thought to the application of the passage to the congregation and the situation.”
–T. H. L. Parker, John Calvin: A Biography (Louisville: Westminster John Knox Press, 1975/2007), 119.