Pile of Indexcards

The practice of writing down thoughts and facts for the purpose of holding them fast and preventing their escape into the dim region of forgetfulness, has been much resorted to by thoughtful and studious men. Lord Bacon left behind him many manuscripts entitled “Sudden thoughts set down for use.” Erskine made great extracts from Burke; and Eldon copied Coke upon Littleton twice over with his own hand, so that the book became, as it were, part of his own mind. The late Dr. Pye Smith, when apprenticed to his father as a bookbinder, was accustomed to make copious memoranda of all the books he read, with extracts and criticisms. This indomitable industry in collecting materials distinguished him through life, his biographer describing him as “always at work, always in advance, always accumulating.” These note-books afterwards proved, like Richter’s “quarries,” the great storehouse from which he drew his illustrations.

source : Self Help, by Samuel Smiles, (1900?)
(digital text at Project Gutenberg)