An important word in this verse is urdhva-retasah, which means brahmacaris who have never discharged semen. Celibacy is so important that even though one does not undergo any austerities, penances or ritualistic ceremonies prescribed in the Vedas, if one simply keeps himself a pure brahmacari, not discharging his semen, the result is that after death he goes to the Satyaloka. Generally, sex life is the cause of all miseries in the material world. In the Vedic civilization sex life is restricted in various ways. Out of the whole population of the social structure, only the grhasthas are allowed restricted sex life. All others refrain from sex. The people of this age especially do not know the value of not discharging semen. As such, they are variously entangled with material qualities and suffer an existence of struggle only. The word urdhva-retasah especially indicates the Mayavadi sannyasis, who undergo strict principles of austerity. But in the Bhagavad-gita (8.16) the Lord says that even if one goes up to Brahmaloka, he again comes back (abrahma-bhuvanal lokah punar avartino rjuna). Therefore, actual mukti, or liberation, can be attained only by devotional service, because by devotional service one can go above Brahmaloka, or to the spiritual world, wherefrom he never comes back. Mayavadi sannyasis are very proud of becoming liberated, but actual liberation is not possible unless one is in touch with the Supreme Lord in devotional service. It is said, harim vina na srtim taranti: without Krsnas mercy, no one can have liberation.