The linguistic theory for the interpretation of mythology is based upon comparative philology, which has proved beyond all contest that the Aryan races had not only their grammar, but a certain number of their myths in common before the separation of the Hindoo, Hellenic, and Teutonic stocks. The Vedic literature exhibits the mythological material in rudiment, and its style approximates to that of poetry. Hence it has been assumed that the disease of language was less virulent in the oldest Aryan writings than it afterwards became in Hesiod and Homer--the _nomina_ had not as yet been so utterly deformed and corrupted into _numina_. The inefficiency of arguments like this is that they have no value except in relation to a previously adopted view. To the opponent of the linguistic as the only scientific method for the explanation of myths, it is left to answer: What you regard as corruption of language I regard as development of thought. What interests me in Greek mythology is precisely this: that the Aryan poems have passed into complicated stories illustrative of pure Hellenic modes of thought and feeling, which in their turn will give occasion for epics, dramas, statues, and philosophies. In the same way, the amount of similarity which comparative mythology has demonstrated in the myths of all the members of the Aryan family is, from the Greek historian's point of view, far less important than their differences. The similarity belongs to the stock as it existed in prehistoric times. The differences mark the external conditions and internal qualities of the nations as they played their part in the world's history. The "disease of language" which severally afflicted the Hindoos, the Persians, the Greeks, and the Scandinavians, turns out to be a faithful mirror of their concrete life. Any one, by way of illustration, can work out the problem of national psychology offered by the nature-worship of the sun in Ormuzd, in Phoebus, and in Balder. The pale and beautiful Balder, who must perish, and whose death involves the world in wailing; the radiant and conquering Phoebus, the healing deity, the purifier, the voice of prophecy and poetry and music; Ormuzd, the antagonist of darkness and of evil, the object of desire and adoration to the virtuous and pure--these sun-gods answer to the races, as their geographical conditions and their spirit made them. Nor is this all. The mythology of each nation has a physiognomy and character of its own--that of the Greeks being clearness and articulation in opposition to the formlessness and misty vagueness of the Hindoos. To mistake a Greek tale of deity or hero for a Hindoo tale of deity or hero is impossible. While the student of prehistorical antiquities will, therefore, direct attention to the likeness revealed by comparative mythology, the historian of nations will rather be attracted by those differences which express themselves in mature art, literature, and religion.[10]