Bhagavad-gita as it is is pure knowledge, beginning with the first knowledge one has to understand, that he is not this body. Because this is the basic principle all ignorance: “I am this body.” “I am American,” “I am Indian,” “I am brahmana,” “I am this,” “I am that”—this is the basic principle. Śrī Caitanya Mahaprabhu also says the same thing in a different way. He says, “I am not a brahmana, I am not a ksatriya, I am not a vaiśya, I am not a śūdra, I am not a brahmacārī, I am not a gṛhastha, I am not avānaprastha, I am not a sannyāsī.“ These are negation. Then what is the positive? He says, gopī–bhartuḥ pada-kamalayor dāsa-dāsānudāsaḥ: [Cc. Madhya 13.80] “I am the servant of the servant of the servant of the gopī–bhartuḥ, Kṛṣṇa, who maintains thegopīs.”

.. You have missed already, because when Śrī Caitanya Mahāprabhu appeared five hundred years ago people already became fools and rascals. They did not care for the teachings of Bhagavad-gītā. Therefore He again came as devotee of Kṛṣṇa to teach us how to serve Kṛṣṇa, how to love Kṛṣṇa. This is Caitanya Mahāprabhu’s cult, the same thing. When Kṛṣṇa appeared He said, sarva–dharmān parityajya mām ekaṁśaraṇaṁ vraja: [Bg. 18.66] “Give up everything, so-called rascaldom. Just surrenderto Me.” And Caitanya Mahāprabhu, He said the same thing as a devotee: yāredekha, tāre kaha ‘kṛṣṇa’-upadeśa
He did not say anything new. That is the authenticity. “I have manufactured some way”—these are all rascaldom. The same thing you should… You can… Just like in your country it is said, “Old wine in a new bottle.” Similarly, Śrī Caitanya Mahāprabhuis teaching the same thing. Kṛṣṇa says, mattaḥ parataraṁ nānyat kiñcid astidhanañjaya. Caitanya Mahāprabhu says the same thing: yāre dekha, tāre kaha‘kṛṣṇa’-upadeśa . And we are saying the same thing, na kṛṣṇāt caitanyāt para–tattvam:“There is no more superior truth than Kṛṣṇa Caitanya.” Why? Because He is talking the same truth as Kṛṣṇa said. This is called paramparā system. What Kṛṣṇa said, CaitanyaMahāprabhu said the same thing, and we are talking the same thing.