Leave on one side also the very large body of political and historical writing. Much of it shows Bible influence. In the nature of the case, any historian of the past three hundred years must often refer to and quote from the English Bible, and must note its influence. An entire study could be devoted to the influence of the English Bible on Green or Bancroft or Freeman or Prescott--its influence on their matter and their manner. Another could be given to its influence on political writing and speaking. No great orator of the day would fail us of material, and the great political papers and orations of the past would only widen the field. Yet while some of this political and historical writing is recognized as literature, most of it can be left out of our thought just now. It may aid in the limiting of the field to accept what Dean Stanley said in another connection: "By literature, I mean those great works that rise above professional or commonplace uses and take possession of the mind of a whole nation or a whole age."[27] This is one of the matters which we all understand until we begin to define it; we know what we mean until some one asks us. The literature of which we are thinking in this narrower sense is in the sphere of art rather than in the sphere of distinct achievement. De Quincey's division is familiar: the literature of knowledge, and the literature of power. The function of the first is to teach; the function of the second is to move. Professor Dowden points out that between the two lies a third field, the literature of criticism. It seeks both to teach and to move. Our concern is chiefly with De Quincey's second field--the literature of power. In the first field, the literature of knowledge, must lie all history, with Hume and Gibbon; all science, with Darwin and Fiske; all philosophy, with Spencer and William James; all political writing, with Voltaire and Webster. Near that same field must lie many of those essays in criticism of which Professor Dowden speaks. This which we omit, this literature of knowledge, is powerful literature, though its main purpose is not to move, but to teach. We are only reducing our field so that we can survey it. For our uses just now we shall find pure literature taking the three standard forms: the poem, the essay, and the story. It is the influence of the English Bible on this large field of literature which we are to observe.