So this is called māyā. Prakṣepātmikā-śakti, covering. Āvaraṇātmikā-śakti, prakṣepātmikā-śakti. There are two kinds of energy of material . . . māyā. One is āvaraṇātmi . . . ignorance. One is living very condemned life; still, he's thinking, "I am very happy," or "We are all right."
So that is called āvaraṇātmikā, covered. Real knowledge is covered. And another śakti is prakṣepātmikā. Prakṣepātmikā means if anyone tries to get out of this . . . suppose our students are coming to Kṛṣṇa consciousness, somebody is coming to us, māyā will dictate, "Oh, why you are coming here? There are so many restrictions and so rules and regulation. Better give it up." "Why, yes, what is this nonsense? Give it up."
This is called prakṣepātmikā. Māyā is dragging. Because the more one is sinful, the more one is miscreant, the more one is the lowest of the mankind, he, māyā will not allow: "Oh, why this rascal is here? He must suffer under me for more . . . some times more, then he may be allowed." That is māyā's business. Thankless business. Just like police.
Police is nobody's enemy, but when criminal, they punish like that, put him in the jail and beats him with a rod. That is the business of māyā, thankless. Nobody will thank police. When police beats, nobody will, "Thank you very much." No. Nobody is happy. Similarly, māyā's business is very thankless task, but she is engaged by the supreme authority to punish.
So, so long one is not conscious that, "What is the position of my life? What I am doing?" that is called knot, tied up very tightly. So here is the medicine. What is that? Yad anudhyāsinā yuktāḥ. Just like if there is very hard knot, you take a sharp knife and you can cut it, then the knot will open, immediately. Similarly, this knot, this materialistic way of life, is very strong. Daivī hy eṣā guṇamayī mama māyā duratyayā (BG 7.14). And this knot is . . . the beginning of the knot is sex life. Beginning of this knot. We are tied up by this sex life. The lowest is the hog. There is also the sex life.
So knot begins . . . puṁsaḥ striyā mithunī-bhāvam etam (SB 5.5.8). The world, we are bound up within this material law of nature—why? Because we have got strong desire for sex. Not only human society, in animal society also, the central point is sex. Yan maithunādi . . .
These people are working so hard because they have got the aim, "I will enjoy sex life." Just like in your country, the hippies. They have given up everything, but sex is there. They cannot give it up. They have renounced everything—their father's property, their happy life, everything—but the sex is there. They cannot leave it. That is the central point of knot. "Where you shall go, sir? Here is your knot."