Srimad Bhagavatam Canto 05, Chapter 19, Text 09

SB 5.19.9

bharate ’pi varse bhagavan nara-narayanakhya akalpantam upacita-dharma-jñana-vairagyaisvaryopasamoparamatmopalambhanam anugrahayatmavatam anukampaya tapo ’vyakta-gatis carati.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
[Sukadeva Gosvami continued:] The glories of the Supreme Personality of Godhead are inconceivable. He has appeared in the form of Nara-Narayana in the land of Bharata-varsa, at the place known as Badarikasrama, to favor His devotees by teaching them religion, knowledge, renunciation, spiritual power, sense control and freedom from false ego. He is advanced in the opulence of spiritual assets, and He engages in executing austerity until the end of this millennium. This is the process of self-realization.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
People in India may visit the temple of Nara-Narayana at Badarikasrama just to learn how the Supreme Personality of Godhead in His incarnation as Nara-Narayana engages in austerities to teach the people of the world how to achieve self-realization. It is impossible to realize oneself simply by absorbing oneself in speculation and material activities. One must be very serious about self-realization and the practice of austerity. Unfortunately, the people of this Age of Kali do not even know the meaning of austerity. Under these circumstances, the Lord has appeared as Sri Caitanya Mahaprabhu to bestow upon the fallen souls the easiest method of self-realization, technically called ceto-darpana-marjanam, cleansing of the dirt from the core of one’s heart. This method is extremely simple. Anyone can chant the glorious krsna-sankirtana — Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare. In this age there are different forms of so-called advanced scientific knowledge, such as anthropology, Marxism, Freudianism, nationalism and industrialism, but if we work very hard under their guidance instead of adopting the process practiced by Nara-Narayana, we shall waste our valuable human form of life. Thus we shall certainly be cheated and misled.
Srimad Bhagavatam Canto 05, Chapter 19, Text 08
Srimad Bhagavatam Canto 05, Chapter 19, Text 10