The word _brahma_ is a neuter noun, and in the Ṛig-vēda it means something that can only be fully translated by a long circumlocution. It may be rendered as "the power of ritual devotion"; that is to say, it denotes the mystic or magic force which is put forth by the poet-priest of the Ṛig-vēda when he performs the rites of sacrifice with appropriate chanting of hymns--in short, ritual magic. This mystic force the Ṛigvēdic poets have represented in personal form as the god Bṛihaspati, in much the same way as they embodied the spirit of the sacrifice in Vishṇu. Their successors, the orthodox ritualists of the Brāhmaṇas, have not made much use of this term; but sometimes they speak of Brahma as an abstract first principle, the highest and ultimate source of all being, even of Prajāpati (Sāmav. B. I. 1, Gōp. B. I. i. 4); and when they speak of Brahma they think of him not as a power connected with religious ceremony but as a supremely transcendent and absolutely unqualified and impersonal First Existence. But the school of the Aupanishadas has gone further. Seeking through works mystic knowledge as the highest reality, they see in Brahma the perfect knowledge. To them the absolute First Existence is also transcendently full and unqualified Thought. As knowledge is power, the perfect Power is perfect Knowledge. Brahma then is absolute knowledge; and all that exists is really Brahma, one and indivisible in essence, but presenting itself illusively to the finite consciousness as a world of plurality, of most manifold subjects and objects of thought. The highest wisdom, the greatest of all secrets, is to know this truth, to realise with full consciousness that there exists only the One, Brahma, the infinite Idea; and the sage of the Upanishads is he who has attained this knowledge, understanding that he himself, as individual subject of thought, is really identical with the universal Brahma. He has realised that he is one with the Infinite Thought, he has raised himself to the mystic heights of transcendental Being and Knowledge, immeasurably far above nature and the gods. He knows all things at their fountain-head, and life can nevermore bring harm to him; in his knowledge he has salvation, and death will lead him to complete union with Brahma.