Despite the fact that the Vishnu Purana describes that Vishnu manifests as Brahma in order to create and as Rudra (Shiva) in order to destroy, Vaishnavism generally does not acknowledge the Trimurti concept; instead, they believe in the avataras of Vishnu like Buddha, Rama, Krishna, etc. They also believe that Shiva and Brahma both are forms of Vishnu. For example, the Dvaita school holds Vishnu alone to be the supreme God, with Shiva subordinate, and interprets the Puranas differently. For example, Vijayindra Tîrtha, a Dvaita scholar interprets the 18 puranas differently. He interprets the Vaishnavite puranas as satvic and Shaivite puranas as tamasic and that only satvic puranas are considered to be authoritative.