If the books which you read are your own, mark with a pen or pencil the
most considerable things in them which you desire to remember. Then you
may read that book the second time over with half the trouble, by your
eye running over the paragraphs which your pencil has noted. It is but a
very weak objection against this practice to say, 'I shall spoil my
book;' for I persuade myself that you did not buy it as a bookseller, to
sell it again for gain, but as a scholar, to improve your mind by it;
and if the mind be improved, your advantage is abundant, though your
book yields less money to your executors.--I. WATTS. _Logic._