They may know something. But Kṛṣṇa says, kṣetra-kṣetrajñayor jñānaṁ yaj jñānaṁ tad mataṁ mama (BG 13.3). Unless you know the kṣetra and kṣetra-jña both, then your knowledge is imperfect. The medical man, very experienced medical man, attending a man on the deathbed, oxygen gas, injection, everything is supplied, but the man dies. And when he dies, the medical man says: "We cannot say what has happened. We have tried our best with the modern medical appliances, but we do not know what has happened." Therefore their knowledge is imperfect. They cannot say. They do not know that there is the soul, kṣetra-jña, who has now left this body; therefore it is nothing but a lump of matter.
Then puruṣa-prakṛti. Prakṛti is this material nature; puruṣa, the living entity. The inferior puruṣa and the superior puruṣa. Anumantā upadraṣṭā, the Supersoul, He is overlooking the activities of the jīva soul, and according to his karma, He is giving a different type of body, kṣetra. Again he is working. Again he is creating another situation. This vast knowledge is unknown to the modern educational department. But here it is in the Bhagavad-gītā. They can take advantage of it. But the fools and rascals will not take advantage. They will remain like animals in the ignorance, like cats and dogs. That is their business.