Having thus arrived at the threshold of the world of Vedic thought, we may now enter through the portals opened by the golden key of scholarship. By far the greater part of the poetry of the Rigveda consists of religious lyrics, only the tenth book containing some secular poems. Its hymns are mainly addressed to the various gods of the Vedic pantheon, praising their mighty deeds, their greatness, and their beneficence, or beseeching them for wealth in cattle, numerous offspring, prosperity, long life, and victory. The Rigveda is not a collection of primitive popular poetry, as it was apt to be described at an earlier period of Sanskrit studies. It is rather a body of skilfully composed hymns, produced by a sacerdotal class and meant to accompany the Soma oblation and the fire sacrifice of melted butter, which were offered according to a ritual by no means so simple as was at one time supposed, though undoubtedly much simpler than the elaborate system of the Brahmana period. Its poetry is consequently marred by frequent references to the sacrifice, especially when the two great ritual deities, Agni and Soma, are the objects of praise. At the same time it is on the whole much more natural than might under these conditions be expected. For the gods who are invoked are nearly all personifications of the phenomena of Nature, and thus give occasion for the employment of much beautiful and even noble imagery. The diction of the hymns is, generally speaking, simple and unaffected. Compound words are sparingly used, and are limited to two members, in marked contrast with the frequency and length of compounds in classical Sanskrit. The thought, too, is usually artless and direct, except in the hymns to the ritual deities, where it becomes involved in conceit and mystical obscurity. The very limited nature of the theme, in these cases, must have forced the minds of the priestly singers to strive after variety by giving utterance to the same idea in enigmatical phraseology.