Whenever I preach, I typically create an outline and then work on a transcription of everything I plan on saying. I then bring the transcript to the pulpit where I will reference it as needed throughout the sermon. This was not how John Calvin rolled:
Based on all available evidence, Calvin preached with no notes, but it was extemporary preaching directly from the original text. We have no manuscripts of Calvin’s preaching extant from his own hand. Gerstner remarks, ‘Calvin preached not only without a manuscript; not only without notes; but apparently without any outline whatever unless it was the order of the verses in the Bible itself.’ The only reason we have so many of his sermons is because a man named Denis Raguenier wrote them down in shorthand between the years 1549 and 1560 (the year of Raguenier’s death). In this period of ten and a half years, Raguenier was able to take down about 2,000 of Calvin’s sermons ipsissima verba, that is, word for word.
John D. Currid, Calvin and the Biblical Languages (Fearn, Ross-shire, UK: Christian Focus Publications, 2006), 25.