The scientists are thinking of making life eternal, immortal. This is also tapasya, the so many scientific endeavor. But they will not take the real method of tapasya, to purify. Their real aim is this material world, and here they want to become immortal. Here, nobody can become immortal.
Lecture on CC Adi-lila 1.11 -- Mayapur, April 4, 1975: Repeatedly we are taking birth and making big, big scheme, and we may be successful, but at any moment Kṛṣṇa says, "Now you get out and your all business finished. And whatever you have done, that is also finished, or I'll take it away," just to teach us that this place, material world, is not our place. That is our misconception, or māyā, that we want to make a permanent settlement in this material world, which is not possible at all.
This knowledge, they do not know. The scientists are thinking of making life eternal, immortal, like the Hiraṇyakaśipu's scheme, that he wanted to be immortal by tapasya. This is also tapasya, the so many scientific endeavor. This is also tapasya. But this tapasya is useless. It has no effect. They are trying foolishly to become immortal. That requires tapasya. Many, many demons... The demons do like that, tapasya for living ever. But they will not take the
real method of tapasya, to purify. Their real aim is this material world, and here they want to become immortal. That is their foolishness. Here, nobody can become immortal. Even Brahmā, who is the creator of this universe, he's also not immortal. But they are trying to be immortal here. That is not possible. Tapasya should be... To become immortal, tapasya is recommended. Tapo divyaṁ putrakā yena śuddhyed sattva [SB 5.5.1]. Tapasya should be made. Immortality is your right. Because you are part and parcel of God, you are immortal. Now you are diseased. You are accepting birth and death. This is diseased condition. So try to cure the disease. Don't try to become immortal in diseased condition. That is not possible. You must cure the disease. If you simply imagine to live eternally, that is not possible. (aside:) Stop these children doing that. Immortal is our goal of life, immortality. That is the goal of life. But they are not taking seriously how to become immortal. That is their ignorance.