SB 1.5 - The perfection of Nārada
Vyāsa answered that despite all this, he was not pacified. Thus he asked Nārada the root cause for his dissatisfaction, for Nārada was a man of unlimited knowledge due to being the offspring of Brahmā. All knowledge disseminated in the material world is related either with the body or with the mind, since everyone is engrossed with identifying the self with the body or mind. Thus one should approach a personality like Nārada, who knows everything mysterious because he worships the creator and destroyer of the material world, the original Personality of Godhead, who is transcendental to the three modes.
A devotee like Nārada, who is an avatāra, can act wonderfully by his spiritual perfection. A devotee of the Lord in full perfection of devotional service is also perfect by the qualification of the Lord. Vyāsa asked such a personality, Nārada, to find out the deficiency in him, for Nārada can penetrate the internal region of everyone like the air, and thus as good as the Supersoul. He knows the whole secret and the secret behind all things. Nārada wanders throughout the three worlds like the sun, which sees everything, and like the life air which moves within, knowing the actions of the intellect. Vyāsa was proficient in the Vedas and have realized the Brahman by proper methods. Still it was not enough.