नाव्यासीनो भगवता प्रोक्तं ब्रह्म सनातनम् ॥ ५६ ॥
nāvy āsīno bhagavatā
proktaṁ brahma sanātanam
aśrauṣīt — he heard; ṛṣibhiḥ — the great saintly persons; sākam — with; ātma-tattvam — the science of self-realization; asaṁśayam — without any doubt (because it was spoken by the Supreme Lord); nāvi āsīnaḥ — sitting in the boat; bhagavatā — by the Supreme Personality of Godhead; proktam — explained; brahma — all transcendental literatures; sanātanam — eternally existing.
While sitting in the boat, King Satyavrata, accompanied by the great saintly persons, listened to the instructions of the Supreme Personality of Godhead in regard to self-realization. These instructions were all from the eternal Vedic literature [brahma]. Thus the King and sages had no doubt about the Absolute Truth.