So if you want to learn that science, how to become immortal, then you have to undergo austerities. That austerities begins with brahmācārya. Tapasā brahmacaryeṇa. Brahmacarya means controlling sex life. That is required. If you can control sex impulse. . . Because that is the medium of bondage. Here in this material world everyone is working hard to enjoy sex life. That is the main aim. Main aim is. . . And that you will find, in your country especially, very, very prominent. In Paris very, very old men, they are going to the club at night simply for the same purpose. So this has to be controlled. Controlled means mind and the senses. And the prominent sense is sex. That is called control.
So if you want to become immortal, then you must practice this. Of course, in Western countries, it is very difficult. They say, "It is impossible." Big, big men, they say, "It is impossible." Yes, it is impossible. Therefore śāstra has given concession that you require sex life, but enjoy it in married life, but no illicit sex. At least, stop this. If you want to be immortal, these things are to be followed: no illicit sex, no intoxication, no meat-eating, no gambling. Then you can think of immortality, gradually. That is called tapasya. Tapasā brahmacaryeṇa. Every śāstra, you'll find. At least at the end of life one should be completely free from these bad habits. That is called sannyāsa. Don't cheat, accept sannyāsa and indulge in these things. Don't be cheater. That is very bad. Sannyāsa means to take vow. In other station of life, there may be we fall down. But sannyāsa means no, no falldown. Therefore we have now taken very seriously. Unless one is found completely competent to accept sannyāsa, there is no more use of awarding sannyāsa. So this is the process. Tapasā brahmacaryeṇa (SB 6.1.13). Brahmacarya is very, very essential. And that is, when one becomes detestful to sex life, that is the beginning of spiritual life. That is the beginning of spiritual life.