They are making scientific researches, but they do not know that every living entity is spirit soul. He has no birth. He has no death. He's eternal. Nityaḥ śāśvato 'yam, everlasting, purāṇaḥ, although oldest, na hanyate. The conclusion: na hanyate hanyamāne śarīre (BG 2.20). So after the annihilation of this body the soul does not die. He accepts another body. This is our disease. This is called bhava-roga. Bhava-roga means material disease. So Kṛṣṇa, being the Supreme Living Entity, nityo nityānāṁ cetanaś cetanānām (Kaṭha Upaniṣad 2.2.13) Kṛṣṇa is exactly like us. Or we are imitation of Kṛṣṇa. The difference is Kṛṣṇa is vibhu, unlimited, and we are aṇu, we are limited. That is the difference. Otherwise, qualitatively, we are as good as Kṛṣṇa. Therefore whatever propensities Kṛṣṇa has, we have got all these propensities. Kṛṣṇa has the propensity to love the other sex. Therefore we have got this propensity, to love the other sex. The beginning of love is there in Rādhā and Kṛṣṇa, eternal love between Rādhā and Kṛṣṇa. So we are also seeking eternal love, but because we are conditioned by the material laws, it is interrupted. It is interrupted.
Bhaktiḥ pareśānubhavo viraktir anyatra syāt (SB 11.2.42). That is the test. So because this disease is called bhava-roga... Bhava-roga means again and again taking birth, bhava-roga. But if we take the medicine, bhavauṣadhi. Everything is there in the Śrīmad-Bhāgavatam. Bhava-roga, the disease of repeated birth and death in the material world, and the chanting of Hare Kṛṣṇa mantra is bhavauṣadhi, the medicine to cure this bhava-roga. Bhavauṣadhāc chrotra-mano-'bhirāmāt ka uttamaśloka-guṇānuvādāt virajyeta pumān vinā paśughnāt (SB 10.1.4). Nivṛtta-tarṣair upagīyamānāt. There are very nice verses in Bhāgavatam. Nivṛtta-tarṣair upagīyamānāt. This chanting of the holy name of Kṛṣṇa, or God, is possible by a person who is disgusted with all these material activities. They can actually chant. That means mukta-puruṣa, liberated soul. It is ... The chanting of Hare Kṛṣṇa mantra is the business of liberated soul, not for the conditioned soul. But even in our conditioned life, we chant, we become gradually purified.