Lord Kṛṣṇa says that: "The four divisions of social order is made by Me." How? Guṇa-karma-vibhāgaśaḥ: by division of quality and work. Not that because one is born in a brahmin family, as it is going on in India. No. In the śāstra there is no such thing, janma-karma-vibhāgaśaḥ. No. Guṇa-karma-vibhāgaśaḥ.
In the Bhagavad-gītā Kṛṣṇa personally says, guṇa-karma-vibhāgaśaḥ. One must have the brahminical qualifications: truthful, clean, sattva, śauca. Sama—controlling the mind; damaḥ—controlling the senses; sattva śauca sama damah, titikṣā—tolerance; ārjava—simplicity; jñānaṁ—full knowledge; vijñānaṁ—practical application in life; jñānaṁ, āstikyaṁ—and full faith in Vedas, that is called āstikyaṁ. This is brahma-karma svabhāva-jam.
So the highest perfection of human life is to attain the brahminical qualification, then everything will be clearly understood: what is God, what I am, what is my relationship with God, what is this world. So many questions. But they are not interested. At the present moment people are not interested in these things, na te viduḥ svārtha-gatiṁ hi viṣṇuṁ. They are interested in animal propensities: how to eat nicely, how to sleep nicely, how to defend nicely, āhāra, nidrā, bhaya, and how to have sex life nicely. That's all.