Prabhupāda:
- tapasā brahmacaryeṇa
- śamena ca damena ca
- tyāgena satya-śaucābhyāṁ
- yamena niyamena vā
- deha-vāg-buddhijaṁ dhīrā
- dharmajñāḥ śraddhayānvitāḥ
- kṣipanty aghaṁ mahad api
- veṇu-gulmam ivānalaḥ
- (SB 6.1.13-14)
So this is first-class human life. This should be the ideal of first-class human life. The first thing is tapasya, austerity, not extravagance. That is not human life. Tapasya. Tapasā means, generally, voluntarily accepting some inconvenience. And then brahmacarya. Brahmacarya means no sex life. According to Vedic civilization, the students, they are called brahmacārī. In student life there is no sex life. Then his brain will be finished. That is happening nowadays. From the student life they indulge in sex life. Therefore not very big men are coming now, because their brain substance is finished. So a brahmacārī is supposed to raise the semina to the brain, ūrdhvam-anti, not discharge, but keep it on the brain. Then their memory becomes very sharp. Once heard from anyone, he will exactly produce, without any forget. Where is that science now? There is no such thing.
So to fulfill the human life, aim of human life, we have to become first-class human being. The first-class human being, ideal human being, is the brāhmaṇa. And the second class, the kṣatriya; the third class, vaiśya; and fourth class, śūdra. So at the present moment, Kali-yuga, kalau śūdrā-sambhavāḥ. In Kali-yuga there is no first class, second class or even third class. All fourth-class men, śūdrā-sambhavāḥ. So therefore they are unable to perform all these tapasya or brahmacarya. Then what is their hope for progress? That has been enunciated in the śāstra, Brahma-vaivarta Purāṇa, and Caitanya Mahāprabhu has given us the formula that,
- harer nāma harer nāma harer nāmaiva kevalaṁ
- kalau nāsty eva nāsty eva nāsty eva gatir anyathā
- (CC Adi 17.21)