We are all intensely eager to know what are the possibilities of humanity. We seek knowledge of them as an heir questions searchingly concerning the extent of the inheritance which has fallen to him. Literature is the inventory of the heritage of humanity. Life is but a succession of emotions; and the earnest mind burns with desire to learn what emotions are within its possibilities. The discoverer of an unsuspected capability of receiving delight, the realization of an unknown sensation, even of pain, increases by so much the extent of the possessions of the human being to whom he imparts it. As explorers in a new country tell one another of the springs upon which they have chanced, of the fertile meadows one has found, of the sterile rocks or the luscious jungle, so men tell one another of their fresh findings in emotion. The knowledge of life--this is the passionate quest of the whole race of men. All that most deeply concerns man, all that reaches most penetratingly to the roots of being, is recorded, so far as humanity has been able to give to it expression, in art. Of all art, literature is perhaps the most universally intelligible; or, if not that, it is at least the most positively intelligible. Our interest in life shows itself in a burning curiosity to know what goes on in the minds of our friends; to discover what others make out of existence, what they find in its possibilities, its limitations, its sorrows, and its delights. In varying degrees, according to individual temperament, we pass life in an endeavor to discover and to share the feelings of other human beings. We explain our feelings, our motives; we wonder whether they look to others as they do to us; we speculate whether others have found a way to get from life more than we get; and above all are we consciously or unconsciously eager to learn whether any other has contrived means of finding in life more vivid sensations, more vibrant emotions, more far-reaching feelings than those which we experience. It is in this insatiable curiosity that our deepest interest in literature lies. Books explain us to ourselves. They reveal to us capabilities in our nature before unsuspected. They make intelligible the meaning and significance of mental experiences. There are books the constant rereading of which presents itself to an imaginative man as a sort of moral duty, so great is the illumination which they throw upon the inner being. I could name works which I personally cannot leave long neglected without a feeling of conscious guilt. It is of books of this nature that Emerson says that they Take rank in our life with parents and lovers and passionate experiences, so medicinal, so stringent, so revolutionary, so authoritative,--books which are the work and the proof of faculties so comprehensive, so nearly equal to the world which they paint, that though one shuts them with meaner ones, he feels the exclusion from them to accuse his way of living.--_Books._