I divide all readers into two classes; those who read to remember and those who read to forget. – William Lyon Phelps

Books, not which afford us a cowering enjoyment, but in which each thought is of unusual daring; such as an idle man cannot read, and a timid one would not be entertained by, which even make us dangerous to existing institution — such call I good books. – Henry David Thoreau

Let your bookcases and your shelves be your gardens and your pleasure-grounds. Pluck the fruit that grows therein, gather the roses, the spices, and the myrrh. – Judah Ibn Tibbon

If the book is second-hand, I leave all its markings intact, the spoor of previous readers, fellow-travellers who have recorded their passage by means of scribbled comments, a name on the fly-leaf, a bus ticket to mark a certain page. – Alberto Manguel, The Library at Night