The third characteristic of literature, arising directly from the other two, is its permanence. The world does not live by bread alone. Notwithstanding its hurry and bustle and apparent absorption in material things, it does not willingly let any beautiful thing perish. This is even more true of its songs than of its painting and sculpture; though permanence is a quality we should hardly expect in the present deluge of books and magazines pouring day and night from our presses in the name of literature. But this problem of too many books is not modern, as we suppose. It has been a problem ever since Caxton brought the first printing press from Flanders, four hundred years ago, and in the shadow of Westminster Abbey opened his little shop and advertised his wares as "good and chepe." Even earlier, a thousand years before Caxton and his printing press, the busy scholars of the great library of Alexandria found that the number of parchments was much too great for them to handle; and now, when we print more in a week than all the Alexandrian scholars could copy in a century, it would seem impossible that any production could be permanent; that any song or story could live to give delight in future ages. But literature is like a river in flood, which gradually purifies itself in two ways,--the mud settles to the bottom, and the scum rises to the top. When we examine the writings that by common consent constitute our literature, the clear stream purified of its dross, we find at least two more qualities, which we call the tests of literature, and which determine its permanence. TESTS OF LITERATURE. The first of these is universality, that is, the appeal to the widest human interests and the simplest human emotions. Though we speak of national and race literatures, like the Greek or Teutonic, and though each has certain superficial marks arising out of the peculiarities of its own people, it is nevertheless true that good literature knows no nationality, nor any bounds save those of humanity. It is occupied chiefly with elementary passions and emotions,--love and hate, joy and sorrow, fear and faith,--which are an essential part of our human nature; and the more it reflects these emotions the more surely does it awaken a response in men of every race. Every father must respond to the parable of the prodigal son; wherever men are heroic, they will acknowledge the mastery of Homer; wherever a man thinks on the strange phenomenon of evil in the world, he will find his own thoughts in the Book of Job; in whatever place men love their children, their hearts must be stirred by the tragic sorrow of _Oedipus_ and _King Lear_. All these are but shining examples of the law that only as a book or a little song appeals to universal human interest does it become permanent.