The names of the gods are generally either common words, still employed, or else words formerly common, whose original sense it is possible to discover. Now both designate the principal phenomena of nature. Thus _Agni_, the name of one of the principal divinities of India, originally signified only the material fact of fire, such as it is ordinarily perceived by the senses and without any mythological addition. Even in the Vedas, it is still employed with this meaning; in any case, it is well shown that this signification was primitive by the fact that it is conserved in other Indo-European languages: the Latin _ignis_, the Lithuanian _ugnis_, the old Slav _ogny_ are evidently closely related to Agni. Similarly, the relationship of the Sanskrit _Dyaus_, the Greek _Zeus_, the Latin _Jovis_ and the _Zio_ of High German is to-day uncontested. This proves that these different words designate one single and the same divinity, whom the different Indo-European peoples recognized as such before their separation. Now Dyaus signifies the bright sky. These and other similar facts tend to show that among these peoples the forms and forces of nature were the first objects to which the religious sentiment attached itself: they were the first things to be deified. Going one step farther in his generalization, Max Müller thought that he was prepared to conclude that the religious evolution of humanity in general had the same point of departure. It is almost entirely by considerations of a psychological sort that he justifies these inferences. The varied spectacles which nature offers man seemed to him to fulfil all the conditions necessary for arousing religious ideas in the mind directly. In fact, he says, "at first sight, nothing seemed less natural than nature. Nature was the greatest surprise, a terror, a marvel, a standing miracle, and it was only on account of their permanence, constancy, and regular recurrence that certain features of that standing miracle were called natural, in the sense of foreseen, common, intelligible.... It was that vast domain of surprise, of terror, of marvel, of miracle, the unknown, as distinguished from the known, or, as I like to express it, the infinite, as distinct from the finite, which supplied from the earliest times the impulse to religious thought and language."[144] In order to illustrate his idea, he applies it to a natural force which holds a rather large place in the Vedic religion, fire. He says, "if you can for a moment transfer yourselves to that early stage of life to which we must refer not only the origin, but likewise the early phases of Physical Religion, you can easily understand what an impression the first appearance of fire must have made on the human mind. Fire was not given as something permanent or eternal, like the sky, or the earth, or the water. In whatever way it first appeared, whether through lightning or through the friction of the branches of trees, or through the sparks of flints, it