It is possible, but it is not provable. But no interpretation of Varuna that ignores his rainy side can be correct. And this is fully recognized by Hillebrandt. On account of his "thousand spies," _i.e.,_ eyes, he has been looked upon by some as exclusively a night-god. But this is too one-sided an interpretation, and passes over the all-important, fact that it is only in conjunction with the sun (Mitra), where there is a strong antithesis, that the night-side of the god is exclusively displayed. Wholly a day-god he cannot be, because he rules night and rain. He is _par excellence_ the Asura, and, like Ahura Mazdao, has the sun for an eye, _i.e.,_ he is heaven. But there is no Varuna in Iranian worship and Ahura is a sectarian specialization. Without this name may one ascribe to India what is found in Iran?[77] It has been suggested by Bergaigne that Varuna and Vritra, the rain-holding demon, were developments from the same idea, one revered as a god, the other, a demon; and that the word means 'restrainer,' rather than 'encompasser.' From all this it will be evident that to claim an original monotheism as still surviving in the person of Varuna, is impossible; and this is the one point we would make. Every one must admire the fine hymn in which he is praised, but what there is in it does not make it seem very old, and the intercalated month is decisive evidence, for here alone in the Rig Veda is mentioned this month, which implies the five-year cyclus, but this belongs to the Brahmanic period (Weber, _Vedische Beiträge_, p. 38). Every explanation of the original nature of Varuna must take into consideration that he is a rain-god, a day-god, and a night-god in turn, and that where he is praised in the most elevated language the rain-side disappears, although it was fundamental, as may be seen by comparing many passages, where Varuna is exhorted to give rain, where his title is 'lord of streams,' his position that of 'lord of waters.' The decrease of Varuna worship in favor of Indra results partly from the more peaceful god of rain appearing less admirable than the monsoon-god, who overpowers with storm and lightning, as well as 'wets the earth.' The most valuable contribution to the study of Varuna is Hillebrandt's 'Varuna and Mitra.' This author has succeeded in completely overthrowing the old error that Varuna is exclusively a night-god.[78] Quite as definitively he proves that Varuna is not exclusively a day-god. Bergaigne, on the other hand, claims an especially tenebrous character for Varuna.[79] Much has been written on luminous deities by scholars that fail to recognize the fact that the Hindus regard the night both as light and as dark. But to the Vedic poet the night, star-illumined, was bright. Even Hillebrandt speaks of "the bright heaven" of day as "opposed to the dark night-heaven in which Varuna also shows himself."[80]