Finally, consider what delightful teaching there is in books. How easily, how secretly, how safely in books do we make bare without shame the poverty of human ignorance! These are the masters that instruct us without rod and ferrule, without words of anger, without payment of money or clothing. Should ye approach them, they are not asleep; if ye seek to question them, they do not hide themselves; should ye err, they do not chide; and should ye show ignorance, they know not how to laugh. O Books! ye alone are free and liberal. Ye give to all that seek, and set free all that serve you zealously. By what thousands of things are ye figuratively recommended to learned men in the Scripture given us by Divine inspiration!

— Richard de Bury, Philobiblon, 1344