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Śrīmad-Bhāgavatam
[Canto 10, Ch. 13]
formed according to the association of the material qualities.  Kāraṇam guṇa-saṅgo 'sya sad-asad-yoni-janmasu  (Bg. 13.22).  Sat  and  asat-svabhāva —one's higher or lower nature—is formed by association with the different qualities, namely  sattva-guṇa ,  rajo-guṇa  and  tamo-guṇa . We should gradually come to the  sattva-guṇa , so that we may avoid the two lower  guṇas . This can be done if we regularly discuss  Śrīmad-Bhāgavatam  and hear about  Kṛṣṇa 's activities.  Naṣṭa-prāyeṣv abhadreṣu nityam bhāgavata-sevayā  ( Bhāg.  1.2.18). All the activities of  Kṛṣṇa  described in  Śrīmad-Bhāgavatam , beginning even with the pastimes concerning  Pūtanā , are transcendental. Therefore, by hearing and discussing  Śrīmad-Bhāgavatam , the  rajo-guṇa  and  tamo-guṇa  are subdued, so that only  sattva-guṇa  remains. Then  rajo-guṇa  and  tamo-guṇa  cannot do us any harm.
Varṇāśrama-dharma , therefore, is essential, for it can bring people to  sattva-guṇa .  Tadā rajas-tamo-bhāvāḥ kāma-lobhādayaś ca ye  ( Bhāg.  1.2.19).  Tamo-guṇa  and  rajo-guṇa  increase lust and greed, which implicate a living entity in such a way that he must exist in this material world in many, many forms. That is very dangerous. One should therefore be brought to  sattva-guṇa  by the establishment of  varṇāśrama-dharma  and should develop the brahminical qualifications of being very neat and clean, rising early in the morning and seeing  maṅgala-ārātrika , and so on. In this way, one should stay in  sattva-guṇa , and then one cannot be influenced by  tamo-guṇa  and  rajo-guṇa .
tadā rajas-tamo-bhāvāḥ kāma-lobhādayaś ca ye ceta etair anāviddham sthitam sattve prasīdati (Bhāg. 1.2.19)
The opportunity for this purification is the special feature of human life; in other lives, this is not possible. Such purification can be achieved very easily by  rādhā-kṛṣṇa-bhajana , devotional service rendered to  Rādhā  and  Kṛṣṇa , and therefore  Narottama dāsa Thākura sings, hari hari viphale janama goṅāinu , indicating that unless one worships  Rādhā-Kṛṣṇa , one's human form of life is wasted.  Vāsudeve bhagavati bhakti-yogaḥ prayojitaḥ/ janayaty āśu vairāgyam  ( Bhāg.  1.2.7). By