The Bhagavad-gītā, the Supreme Personality, Kṛṣṇa, He is instructing. That is kṛṣṇa-upadeśa. And Śrīmad-Bhāgavatam is speaking about Kṛṣṇa. That is also kṛṣṇa-upadeśa. Kṛṣṇasya upadeśa iti kṛṣṇa-upadeśa, and Kṛṣṇa, subject matter Kṛṣṇa and upadeśa, that is also kṛṣṇa-upadeśa. So Caitanya Mahāprabhu says that, "You simply preach kṛṣṇa-upadeśa. Then you become guru."
- yāre dekha tāre kaha 'kṛṣṇa'-upadeśa
- āmāra ājñāya guru hañā tāra' ei deśa
- (CC Madhya 7.128)
Not only that. He has empowered all Indians.
- bhārata-bhūmite haila manuṣya-janma yāra
- janma sārthaka kari' kara para-upakāra
- (CC Adi 9.41)
This Kṛṣṇa consciousness movement, to spread this Kṛṣṇa consciousness movement is the best welfare activity in the human society. The best. There is no more better welfare . . . there are so many welfare activities in the human society, but this kṛṣṇa-upadeśa, to instruct people about the primary principles of Bhagavad-gītā in the human society, that is the best para-upakāra. People do not know how to become happy. They are . . . manaḥ ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7). They are simply making struggle for existence by mental concoction. Manaḥ ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7). In this material world, they are simply struggling. There is no solution. Therefore the every Indian should study Bhagavad-gītā and, if possible Śrīmad-Bhāgavatam, and assimilate it and preach all over the world. This is the duty of India. India has no other duty. Para-upakāra.
So with our one man's endeavor, teeny effort, you . . . we can see that so many outsiders, they're attracted to Kṛṣṇa consciousness. Unless there is something substance . . . they are not illiterate. They are not fools. They are not poor. Why they are attracted? There is something to be learned from Kṛṣṇa consciousness. So if this Kṛṣṇa consciousness movement is spread all over the world regularly, then the face of the world will change. That's a fact. Sarve sukhino bhavantu. This is the Vedic mission, "Let everyone become happy." And how he'll be happy? He cannot become happy by mental concoction. That is not possible. Manorathenāsati dhāvato bahiḥ (SB 5.18.12). If one is situated on the mental platform, speculating, he will simply go to the asat. Asat means this material world. Asato mā sad gama. Vedic says: "Don't remain in this asat. Come to the sat. Oṁ tat sat."
So if one is on the mental speculation, manufacturing something for the welfare of the human society, that is not possible. Human society cannot be happy without Kṛṣṇa consciousness.