Indeed, many of them will not be understood until they are read in the light of long periods of history; for as the great books are interpretations of life, so life in its historic revelation is one continuous commentary on the greater books.
This preponderance of the permanent over the accidental or temporary in books of this class is largely due to the unconscious element which plays so great a part in them: the element of universal experience, in which every man shares in the exact degree in which, in mind and heart, he approaches greatness.

It is idle to attempt to separate arbitrarily in Shakespeare, for instance, those elements in the poet's work which were deliberately introduced from those which went into it by the unconscious action of his whole nature; but no one can study the plays intelligently without becoming more and more clearly aware of those depths of life which moved in the poet before they moved in his work; which enlarged, enriched, and silently reorganised his view of life and his power of translating life out of individual into universal terms.

It would be impossible, for instance, to write such a play as "The Tempest" by sheer force of intellect; in the creation of such a work there is involved, beyond literary skill, calculation, and deep study of the relation of thought to form, a ripeness of spirit, a clearness of insight, a richness of imagination, which are so much part of the very soul of the poet that he does not separate them in thought, and cannot consciously balance, adjust, and employ them.

They are quite beyond his immediate control, as they are beyond all attempts to imitate them.
Cleverness may learn all the forms and methods, but it is powerless to imitate greatness; it can simulate the conscious, dexterous side of greatness, but it cannot simulate the unconscious, vital side.

The moment a man like Voltaire attempts to deal with such a character as Joan of Arc, his spiritual and artistic limitations become painfully apparent; of cleverness there is no lack, but of reverence, insight, depth of feeling, the affinity of the great imagination for the great nature or deed, there is no sign.