There are three guṇas; therefore the material nature is called guṇa-mayī. Daivī hy eṣā guṇamayī mama māyā duratyayā (BG 7.14). Kṛṣṇa says that this material energy... There are three different energies of the Supreme Lord. He has got multi-energies, parasya śaktir vividhaiva śrūyate (Cc. Madhya 13.65, purport). We can see activities are going on, different varieties of activities in this world, but they have been summarized into three divisions: sattva-guṇa, rajo-guṇa, tamo-guṇa. So sattva-guṇa, rajo-guṇa... The animals, they are in the tamo-guṇa. Then gradually they are elevated by the evolutionary process to the rajo-guṇa, and then we are elevated to the sattva-guṇa. That is the brahminical qualification. And we have to surpass the sattva-guṇa also. Not that coming to the platform of sattva-guṇa we become perfect. No. There is chance of falling down from the sattva-guṇa. We have got practical experience in this age, Kali-yuga, many persons have fallen down from the platform of brahminical qualification. The brahminical qualification is the platform of sattva-guṇa: śamo damo titikṣava ārjavaṁ jñānaṁ vijñānam āstikyaṁ brahma karma svabhāva-jam (BG 18.42). This is the brahminical culture.
So if by coming to the platform of brahminical culture, one is sure, that is not possible. That is explained in the Bhagavad-gītā. Sometimes sattva-guṇa is overpowered by rajo-guṇa or rajo-guṇa is overpowered by tamo-guṇa or sattva-guṇa is overpowered by tamo-guṇa. In this way, topsy-turvy it is going on. That is material world. But if you want to become above the material platform, then you have to take to the platform of devotional service. That is mentioned in the Bhagavad-gītā: