The Bhagavad-gītā's mysteries belong only to sincere devotees in guru-disciple succession, never to scholars.Listen — Srila Prabhupada Uvaca
] ...any learned scholar. He was a military man. Then why Kṛṣṇa to discuss the mystery of Bhagavad-gītā to him? Because his qualification is accepted by Kṛṣṇa that "I am speaking to you that old system of Bhagavad-gītā, Arjuna, because you are My devotee and you are My confidential friend." So we have to become a devotee or we have to establish a transcendental relationship with Kṛṣṇa.
Then it is possible to understand what is the mystery of Bhagavad-gītā. Bhagavad-gītā cannot be understood by so-called scholars by academic degrees. One has to become a devotee of Kṛṣṇa. One has to become a friend or some way related with Kṛṣṇa.
Then it is possible to understand Bhagavad-gītā. Otherwise it is impossible. My Guru Mahārāja used to say that one who is licking up the bottle of honey, he is thinking that "I am licking honey," but that is impossible. Similarly, the so-called scholars, when they comment on Bhagavad-gītā, they are licking up the bottle of honey. The taste of honey is different. That taste one can get when the bottle is opened by [indistinct] person.
Then he can taste the Bhagavad-gītā. Otherwise, licking up the bottle, that's all. If one is satisfied by licking up the bottle of honey, without tasting it, then is he not a fool? [laughter] The fools say, "I have got the honey!" but it is not opened. Therefore in Bhagavad-gītā it is said, rahasyaṁ hy etad uttamam [Bg. 4.3]. [That very ancient science of the relationship with the Supreme is today told by Me to you because you are My devotee as well as My friend; therefore you can understand the transcendental mystery of this science.] Rahasyam, the transcendental secrecy of Bhagavad-gītā, that secret will not be opened to a so-called scholar or academic educated.
It must be taken from the [indistinct] authorized person, evaṁ paramparā prāptam [Bg. 4.2], by disciplic succession. [This supreme science was thus received through the chain of disciplic succession, and the saintly kings understood it in that way. But in course of time the succession was broken, and therefore the science as it is appears to be lost.] Otherwise... [end]