If the gods be described as personalities, each one of whom possesses a more or less definite individuality, it is at once evident that the conception of an animated natural phenomenon--the idea, for example, that the setting sun is a being which a dark cloud-demon is devouring--cannot in and of itself as yet be called a god-idea. Just as the character of a man may be known only from the manner in which he reacts towards the objects of his experience, so also is the nature of a god revealed only in his life and activity, and in the motives that determine his conduct. The character of the god is expressed, not in any single mythological picture, but in the _myth_ or mythological tale, in which the god figures as a personal agent. It is significant to note, however, that the form of myth in which god-ideas come to development is not the deity saga, in the proper sense of the term, but the _hero saga_, which becomes a combined hero and deity saga as soon as both gods and heroes are represented as participating in the action. The deity saga proper, which deals exclusively with the deeds of gods and demons, is, as we shall see below, only of secondary and of later origin. It is not to such deity sagas, therefore, that we must turn if we would learn the original nature of gods. This circumstance in itself offers external evidence of the fact that gods did not precede heroes, but, conversely, that heroes preceded gods. Or, at least, to be more accurate, the idea of the divine personality was developed in constant reciprocity with that of the hero personality, in such wise, however, that with reference to details the hero paved the way for the god, and not conversely.