Śrīmad-Bhāgavatam 7.9.54 - Vṛndāvana, April 9, 1976
Now, if you study the whole world at the present moment, they do not believe in the soul. They do not believe in the transmigration of the soul from one body to another. Even big, big professors, big, big learned scholars, they do not believe. So therefore you can understand that what is the present population of the world—all rascals. All rascals. They cannot understand the simple truth, and they are passing on as great scholars, great scientists, great politicians and so on, so on, but all of them rascals.
That's all. This is the conclusion. Kṛṣṇa says, dhīras tatra na muhya... This transmigration of the soul from one body to another, Kṛṣṇa says, dhīras tatra na muhyati. And here also the same thing, prīṇanti hy atha māṁ dhīrāḥ sarva-bhāvena sādhavaḥ. The spiritual... If you do not understand what is spirit, then where is the question of spiritual life and advancement of spiritual life? There is no question. This is the beginning of spiritual existence..., education, that "I am not this body. I am spirit soul." Ahaṁ brahmāsmi. They can understand.
Jaya Srila Prabhupada