Is recommended. Tapo divyam putraka yena suddhyed 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. So this how to become immortal, there is process recommended in the sastras. That is in India. That is nowhere else. If you actually serious about becoming immortal, then you should study the Vedic literatures from India. That is Caitanya Mahaprabhu's mission, that in India there is the process, how to become immortal. So He recommended, therefore, He desired, that Indians, you Indians, you have got the facility. Don't spoil your life by imitating the so-called rascal scientists of the Western countries, but you take advantage of the science, spiritual science, which is in India, and distribute the knowledge, because they are in ignorance. Therefore He says, 

bharata bhumite manusya janma haila yara
janma sarthaka kari' karo paropakara
[Cc. Adi 9.41]
This should be the India's business. This whole world is in darkness, demonic civilization. And India, there is the remedy. So if the Indians take advantage and make his life perfect and then go to the Western countries and distribute this immortal knowledge, that is real business of India. Unfortunately, they are trying to imitate. There is no thing, nothing to imitate. And if you say that they have discovered so many material comforts, that is all right. But with all your material comforts, you cannot become immortal. That is certain. That is certain. But you are desiring how to become immortal. That science is in India.

>>> Ref. VedaBase => Sri Caitanya-caritamrta, Adi-lila 1.11 — April 4, 1975, Mayapur