Celio Calcagnini, Letter to Tommaso Calcagnini:

“For my part, whatever I read, whatever I think, I store it in the storehouses of my mind as if I were about to bring it forth for the use of human activity. And since I think that it is too difficult to excerpt everything separately, I put many things into a commentary, or write it separately on a little sheet. But in the margin, I make compendious notes, separate from the text, of everything which seems worth of some notice. If any of these things really stand out as particularly capital or excellent, I place them in the peak (or one might say the crown) of the margin. From this practice springs some utility, allowing me to reconsider several volumes within the space of an hour and a half. I once tried to wrangle Pliny’s Natural History into an epitome, since I…