So the self-realization process is to be achieved by this human form of life. That is... Our Kṛṣṇa consciousness movement is indicating everyone. We are teaching that "Don't spoil your this rare human form of life simply by engaging yourself in the matter of sense gratification." Because sense gratification ample, or sufficient sense gratification opportunity you had even in the hog's life. Because we have migrated, we have evolved from hog's life also. Sometimes we had been a hog or a dog or something like that. Now we have come to this stage of life, this life should not be spoiled like the cats, dogs and hogs. But we should have some restraint and realize ourself. This possibility is there simply by chanting these sixteen words: Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. This is possible. This is practical. Since I came to your country in 1965... Of course, for one year I was traveling here and there, but in 1966 I established first my class in New York at 26 Second Avenue. Then there were many branches now. We have got about sixteen branches all over the country. And these students, they are chanting, and they have taken to the austerity. I don't accept any cheap student or cheap disciple. My first condition is that there is no illicit sex life, there is no intoxication, there is no gambling, and there is no meat-eating. These four principles are there, but all my students in these twenty, about sixteen centers—one in London, one in Germany—but you will be surprised that all these boys and girls, they have taken to this austerity very seriously. They're not drinking even tea or smoking a cigarette.
So spiritual life does not mean a whimsical life. It is, first of all basic principle is, that building character. In the Bhagavad-gītā you will find that when Arjuna is accepting Lord Kṛṣṇa, he is saying that paraṁ brahma paraṁ dhāma pavitraṁ paramaṁ bhavān: (BG 10.12) "My dear Lord, Kṛṣṇa, You are the most purest." Purest. Most pure. Paraṁ brahma paraṁ dhāma: "You are the Supreme Lord. You are pure." So idea is that if you want to have spiritual life, you have also become, to become pure. Without being pure... That pureness... This evolution means gradual process of purifying process. You are not... You are distinct from cats and dogs means your body is purified than the body of the cats and dogs. So purification required. The first principle of purification are these four regulative principles. So they have taken to this very easily. Some of them, students, they were, six months ago they were not my students, but by chanting Hare Kṛṣṇa they have seriously taken to these principles of austerities. That is not... That is stated by Lord Caitanya Mahāprabhu, that ceto-darpaṇa-mārjanam (CC Antya 20.12). As soon as you come to the understanding that "I am not this ma... I am not this matter; I am spirit soul," immediately this process will follow, that you will have no unnecessary material demands. Smoking is not a necessary thing, but you have learned it by society or by company. So it is not necessary. It is unnecessary. Similarly, gambling is also unnecessary. Simply... Similarly, illicit sex life is also unnecessary. Oh, all these things are unnecessary, but we have gathered by some association for company. Similarly, you can give it up also, by association. So ceto-darpaṇa-mārjanaṁ bhava-mahā-dāvāgni-nir... (CC Antya 20.12). And unless you purify yourself, you cannot understand yourself or the position of God.