The so-called yoga societies in big cities may be successful in earning material benefit, but they are not at all suitable for the actual practice of yoga. One who is not self-controlled and whose mind is not undisturbed cannot practice meditation. Therefore, in theBṛhan-nāradīya Purāṇa it is said that in Kali-yuga (the present yuga, or age), when people in general are short-lived, slow in spiritual realization and always disturbed by various anxieties, the best means of spiritual realization is chanting the holy name of the Lord.
harer nāma harer nāma
harer nāmaiva kevalam
kalau nāsty eva nāsty eva
nāsty eva gatir anyathā
(CC.1:17:21)
"In this age of quarrel and hypocrisy the only means of deliverance is chanting the holy name of the Lord. There is no other way. There is no other way. There is no other way."
(Bhagavad-Gita----6:11-12-----purport).

The earth planet was submerged in the mire, but on hearing the sound of the Lord, the inhabitants of the higher planets were all jubilant because they knew that the Lord was there to deliver the earth. Therefore Brahmā and all the sages, such as Bhṛgu, Brahmā's other sons, and learned brāhmaṇas, were enlivened, and they concertedly joined in praising the Lord with the transcendental vibrations of the Vedic hymns. The most important is the Bṛhan-nāradīya Purāṇa verse Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare.
(Srimad Bhagavatam-----3:13:25-----purport).

The entire world is working under the influence of the modes of material nature, especially ignorance and passion, but if people engage in hearing and chanting about the glories of the Supreme Lord, their lives can be successful, and they can be elevated to the highest perfection. In the Bṛhan-nāradīya Purāṇa, therefore, it is said:
harer nāma harer nāma
harer nāmaiva kevalam
kalau nāsty eva nāsty eva
nāsty eva gatir anyathā
(CC.1:17:22)
"In this age of Kali, there is no other way, no other way, no other way for spiritual perfection than the holy name, the holy name, the holy name of the Lord."
(Srimad Bhagavatam-----5:1:15-----purport).

Although prakṛti and puruṣa superficially appear to be the causes of the material manifestation, both are emanations of different energies of the Supreme Lord. Therefore the Supreme Lord is the cause of prakṛti and puruṣa. He is the original cause (sarva-kāraṇa-kāraṇam (Bs. 5.1)). The Nāradīya Purāṇa says:
avikāro 'pi paramaḥ
prakṛtis tu vikāriṇī
anupraviśya govindaḥ
prakṛtiś cābhidhīyate
Both the prakṛti and puruṣa, which are inferior and superior energies, are emanations from the Supreme Personality of Godhead.
(Srimad Bhagavatam-----6:9:26-27-----purport).

To emphasize something to an ordinary person, one may repeat it three times, just as one might say, "You must do this! You must do this! You must do this!" Thus the Bṛhan-nāradīya Purāṇa repeatedly emphasizes the chanting of the holy name so that people may take it seriously and thus free themselves from the clutches of māyā. It is our practical experience in the Kṛṣṇa consciousness movement all over the world that many millions of people are factually coming to the spiritual stage of life simply by chanting the Hare Kṛṣṇa mahā-mantra regularly, according to the prescribed principles. Therefore our request to all our students is that they daily chant at least sixteen rounds of this harer nāma mahā-mantra (CC.1:17:22) offenselessly, following the regulative principles. Thus their success will be assured without a doubt.
(Sri Caitanya Caritamrta-----1:17:23-----purport).

The word ātmā also means "to endeavor." In every practice there is some endeavor, and the ultimate endeavor is the endeavor to reach the highest perfectional stage of devotional service. In Śrīmad-Bhāgavatam (1.5.18) it is stated that one should try to attain the highest goal, which cannot be attained either in the higher or lower planetary systems. The idea is that material happiness and misery are available in all planetary systems in the course of time, but the highest achievement, devotional service, cannot be attained anywhere without endeavor. Therefore in the Bṛhan-nāradīya Purāṇa it is said that one who is serious about understanding the highest perfectional stage of devotional service can become successful in everything simply by his endeavor.
(Teachings of Lord Caitanya).