Right person
Bhagavad-gita As It Is
BG Chapters 1 - 6
Arjuna bases his argument not on his own personal experience, but on what he has heard from the authorities. That is the way of receiving real knowledge. One cannot reach the real point of factual knowledge without being helped by the right person who is already established in that knowledge.
Srimad-Bhagavatam
SB Canto 1
No one can be pure in action who is not pure in eating, sleeping, fearing and mating. But somehow or other if someone hears with rapt attention from the right person, at the very beginning one can assuredly see Lord Śrī Kṛṣṇa in person in the pages of Bhāgavatam.
Śrī Vyāsadeva is therefore advised by Nārada to describe the science of God directly by relating His transcendental activities. Vyāsadeva is himself a personality expert in this science, and he is unattached to material enjoyment. Therefore he is the right person to describe it, and Śukadeva Gosvāmī, the son of Vyāsadeva, is the right person to receive it.