Who · Nārada, the sages he served, Kṛṣṇa and Vyāsadeva
The story · Nārada told Vyāsadeva how serving sages and taking the remnants of their food with permission purified his heart. He developed strong faith in them and followed them with body and mind. Later, while meditating with transcendental love, he shed tears, and Śrī Kṛṣṇa appeared within his heart. The Lord spoke comforting words and explained that service to Him gives firm intelligence and leads to His association. Nārada described how, after meeting death absorbed in Kṛṣṇa, he came to travel freely by the Lord’s grace, fixed in unbroken devotional service.
What it teaches · Service to devotees purifies the heart and awakens faith. Restraining the senses alone does not satisfy the soul; satisfaction comes from devotional service to the Personality of Godhead.