The society, the human society, not the animal society. Kṛṣṇa says: cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma (BG 4.13). Guṇa-karma-vibhāgaśaḥ. So according to guṇa, if we are associated with sattva-guṇa, then that class is called brāhmin. If one is associating with rajo-guṇa, that class is called kṣatriya. If one is associating with mixed guṇa, especially rajo-guṇa and tamo-guṇa, that class is called vaiśya, and if one is associating with tamo-guṇa, that class is called śūdra. Cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ.
So in this way, there are varieties of life. But that opportunity is given by Kṛṣṇa. Because He's witness. He is anumantā, upadraṣṭā. He's seeing everything. He is within our heart: īśvaraḥ sarva-bhūtānāṁ hṛd-deśe arjuna tiṣṭhati (BG 18.61). So in this way we are changing different varieties of life—sometimes human being, sometimes animal, sometimes demigod, sometimes something else; sometimes rich man, sometimes poor man, sometimes brāhmin, sometimes śūdra. In this way, we are wandering in different species of life and different position, in different planets. There are millions and trillions of planets, and there are 8,400,000 species of life. In this way, we are wandering. This is our position.
So this is not very good business. Bhūtvā bhūtvā pralīyate (BG 8.19). We accept . . . just like we have got this now human form of body, Mr. Such-and-such, very good position, very good business, very good . . . but at any moment, I'll be kicked out. At any moment. That is no guarantee. And again I'll have to accept, according to my karma, another body where I may not get this position. I may be . . . I may not be even human being. Because, according to my mentality, I'll get the body. Yaṁ yaṁ vāpi smaran loke tyajaty ante kalevaram (BG 8.6). Our next birth will be settled according to the mental condition at the time of death.
So that mental condition one has to practice. What kind of practice? That is also, how the practice should be done, that is also indicated in the Bhagavad-gītā: yānti deva-vratā devān pitṟn yānti pitṛ-vratāḥ (BG 9.25). They are trying to go to the moon planet, but you cannot go in that way. That is not possible. You cannot go by force in any planet.
You have to prepare yourself. Just in this planet also, if you want to go to some other country, in America, you have to prepare yourself for passport, visa, and what . . . so many papers, P-form, and bank balance, this, that, so many things. You cannot by force that, "I have come to America . . ." The immigration department will immediately check: "Where is your passport? Where is your visa? Where is your bona fide?"
Similarly, if such rules and regulation are here, even in this planet, how you dare to go into the moon planet or other planet by force? This is all childish. Now they have stopped. The American government has stopped financing this foolish excursion, going to the moon planet. They have stopped. They have now come to sense that simply these so-called scientists, they're experi . . . experimenting on public money and wasting.
Long, long ago, when I wrote my book Easy Journey to Other Planet, I described: "This moon planet excursion, simply childish and foolishness." And about two, three years ago, in San Francisco the press reporters asked my opinion about the moon, moon planet. So I told them: "It is simply waste of time and money." Now, now it is happening. Long, long ago, I said this.