It is the revealed word of God. But as to how to interpret what is heard, what is revealed, was and still is as difficult as in any other religion. Dvaitavada Vedanta claims there is nearness and likeness between God and man. Brahmanism includes many divisions and as such many worshippers who call themselves by different names. One sect was influenced by the other.
Many sects also share much in common.
It is indeed a hard task if not altogether impossible to make hard and fast distinctions. In general Brahmanism follows the Agamas or Tantra Shastras. These, in their turn, admit the authority of the Vedas and recognize other Scriptures. There are four main classes of Brahminical Scriptures and each one of them was revealed as the specific scripture for a certain yuga or age. There were four of them.