Prabhupada's lecture - Śrīmad-Bhāgavatam 1.15.37 - Los-Angeles, December 15, 1973
The whole target is how to train the citizens, go back to home, back to Godhead. Because they have come from God. Kṛṣṇa-bahirmukha hañā bhoga vāñchā kare. He has come to this material world to enjoy false gratification, and he is loitering throughout the whole universe, simply "Where is better sense gratification, better sense gratification?" But he will never be happy by sense gratification. That is not possible. He has forgotten what is actually happiness. Actual happiness is not sense gratification. That is... They are described in the Bhagavad-gītā. Sukham ātyantikaṁ yat tad atīndriyaṁ grāhyam: [Bg. 6.21] "What is real happiness, that is to be understood beyond sense gratification." Not sense gratification. Therefore you will find nobody is happy, even he has got facility for sense gratification. Ask anybody, "If you are satisfied fully?" No, that is not possible. Because that is not happiness. That is illusion. That is illusion. We are accepting false thing as happiness. That is not happiness.
Happiness beyond sense gratification. Sukham ātyantikaṁ yat tad atīndriyaṁ grāhyam. Atīndriya means the senses, when they are purified, with that senses, when you try to enjoy, then that is real happiness. That is real happiness. Just like if your tongue is diseased, or if you are diseased, then you cannot taste what is actually rasagullā taste. Because the tongue is distasteful, you cannot enjoy it. Similarly, so long your senses are diseased in condition, you cannot enjoy senses. You shall... It has to be purified. That purification method is this Kṛṣṇa consciousness. You purify your senses. Sarvopādhi-vinirmuktaṁ tat-paratvena nirmalam [Cc. Madhya 19.170]. Nirmalam means purified. So how these things can be purified? Sarvopādhi-vinirmuktam. You have to be free from all designation. Designation. So at the present moment I am thinking, "This is my hand. I am American. Therefore this is my American hand." "I am Indian; therefore it is my Indian hand." So you have to forget this, or you have to purify: "This hand is neither American nor African nor Indian. This hand belongs to Kṛṣṇa." This is purification.