So sāṅkhya philosophy is always there. Kāla-viplutam. In due course of time, everything becomes invisible or unknown. Just like Bhagavad-gītā. Bhagavad-gītā was spoken long, long ago, before speaking to Arjuna. Imaṁ vivasvate yogaṁ proktavān aham avyayam [Bg. 4.1]. Therefore, all Vedic knowledge, they are not research knowledge. They are existing always, since the time of creation. These so-called scientists, they are simply wasting their time by so-called research work. There is nothing to be researched. Everything is there.
Every knowledge is there. How to make your life perfect, that is also there, but they will not consult this knowledge. They will try to make a research and waste time and waste money, public money, and pass on as great scientist, philosopher, leaders, politician, and mislead people, without any factual knowledge. Now they are thinking, at the present moment, the scientists, that things are diminishing. Actually, they'll diminish. It is already stated in the Śrīmad-Bhāgavatam. It will so diminish that there will be no more wheat, no more rice, no more food grains, no more fruits, and no more milk, no more sugar. It will be finished. Simply you have to eat stones and seeds and flesh. You'll have to. And the politicians will go on exploiting.
Prabhupada's lecture - Śrīmad-Bhāgavatam 1.3.10 - Los Angeles, September 16, 1972