MARGINAL NOTES AND COMMONPLACE BOOKS
It is the practice of many readers to note, in the margin of their books, the most important passages, the strongest arguments, or the brightest sentiments. Thus they load their minds with superfluous attention, repress the vehemence of curiosity by useless deliberation, and by frequent interruption break the current of narration or the chain of reason, and at last close the volume, and forget the passages and marks together.
Others I have found unalterably persuaded that nothing is certainly remembered but what is transcribed; and they have therefore passed weeks and months in transferring large quotations to a commonplace book. Yet, why any part of a book, which can be consulted at pleasure, should be copied, I was never able to discover. The hand has no closer correspondence with the memory than the eye. The act of writing itself distracts the thoughts, and what is read twice is commonly better remembered than what is transcribed. This method therefore consumes time without assisting memory.
The true art of memory is the art of attention. No man will read with much advantage, who is not able, at pleasure, to evacuate his mind, or who brings not to his author an intellect defecated and pure, neither turbid with care, nor agitated by pleasure. If the repositories of thought are already full, what can they receive? If the mind is employed on the past or the future, the book will be held before the eyes in vain. What is read with delight is commonly retained, because pleasure always secures attention: but the books which are consulted by occasional necessity, and perused with impatience, seldom leave any traces on the mind.—S. Johnson. Idler, 74.