proktaṁ brahma sanātanam

asrausit-he heard; rsibhih-the great saintly persons; sakam-with; atma-tattvam-the science of self-realization; asamsayam-without any doubt (because it was spoken by the Supreme Lord); navi asinah-sitting in the boat; bhagavata-by the Supreme Personality of Godhead; proktam-explained; brahma-all transcendental literatures; sanatanam-eternally existing.