We are within this material world on account of this pravṛtti, sense enjoyment. Those who are inclined to sense enjoyment and do not care to know what is the aim of life, they are called asuras. And those who are trying to avoid the entanglement of this material life and revive the whole original life . . . whole original life means Kṛṣṇa conscious life. Because we are part and parcel of Kṛṣṇa, our original consciousness is that, "I have got intimate relationship with Kṛṣṇa as His part and parcel." That is Kṛṣṇa consciousness. And the . . . my conception is the bodily conception that, "I am this body. I am born in this country; therefore I belong to this nation, I belong to this community, I belong to this family, I belong to this species," this is called pravṛtti-mārga. This is scientific division, pravṛtti-mārga, nivṛtti-mārga.
Why the scientific? Because this is the fact. Science means fact. I am not this body. I am spirit soul. That is, just like a man suffering from some disease, so that is not his normal life to suffer from some disease. Normal life is to keep healthy life, no disease. That is normal life. So in order to keep to the normal life, we must know how to cure the disease. Just like when you have got fever, you go to the doctor; he says, advises, "You do this" and "You do not do this." The "do not do this" means nivṛtti-mārga, and "do this," pravṛtti-mārga. If you are serious to cure your disease, then you must know what you should do and what you should not do. But just like a man, very foolish man, he is suffering from disease but he does not know how to cure the disease, what to do and what not to do, similarly an animal-like man, a two-legged man, he does not know what to do and what not to do. This is explained here.
Pravṛttiṁ ca nivṛttiṁ ca, janā . . . pravṛttiṁ ca nivṛttiṁ ca, janā na vidur āsurāḥ (BG 16.7). Janā, there are two kinds of men, asura and daiva. Daiva āsurā eva ca. There are two, all throughout the whole universe, there are two classes of men: one is called daiva, another is called asura. What is the distinction? Viṣṇu-bhaktaḥ bhaved daiva āsuras tad-viparyayaḥ (CC Adi 3.91). One who knows his relationship with God, he is called daiva, and one who does not know, just like animal, they are called asura. There is no particular caste or creed, that here is a caste of asura, caste of daiva. No. Anyone who knows what is God and his relationship with God, sambandha, and then work according to that relation and achieve the goal of life, he is called daiva, or devatā. And one who does not know this, what is the goal of life, what is God, what is my relationship with God, he is asura.