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Śrīmad-Bhāgavatam
[Canto 4, Ch. 24]
the mind;  dhiyaḥ —with intelligence;  sarve —all of you;  etat —this;  abhyasata —practice;  ādṛtāḥ —with great reverence.
TRANSLATION
My dear princes, in the form of a prayer I have delineated the yoga system of chanting the holy name. All of you should take this important stotra within your minds and promise to keep it in order to become great sages. By acting silently like a great sage and by giving attention and reverence, you should practice this method.
PURPORT
In the  haṭha-yoga  system one has to practice bodily exercises,  dhyāna ,  dhāraṇā ,  āsana , meditation, etc. One also has to sit in one place in a particular posture and concentrate his gaze on the tip of the nose. There are so many rules and regulations for the  haṭha-yoga  system that it is practically impossible to perform it in this age. The alternative system of  bhakti-yoga  is very easy not only in this age but in others as well, for this  yoga  system was advocated long ago by Lord Śiva when he advised the princes, the sons of Mahārāja Prācīnabarhiṣat. The  bhakti-yoga  system is not newly introduced, for even five thousand years ago Lord Kṛṣṇa recommended this  bhakti-yoga  as the topmost  yoga . As Kṛṣṇa tells Arjuna in  Bhagavad-gītā :
yoginām api sarveṣām  
 mad-gatenāntarātmanā  
 śraddhāvān bhajate yo mām  
 sa me yuktatamo mataḥ
“Of all  yogīs , he who always abides in Me with great faith, worshiping Me in transcendental loving service, is most intimately united with Me in  yoga  and is the highest of all.” (Bg. 6.47)
In other words, this system of  bhakti-yoga  has been existing from time immemorial and is now continuing in this Kṛṣṇa consciousness movement.
The word  muni-vratāḥ  is significant in this regard because those who are interested in advancing in spiritual life must be silent. Silence means talking only of  Kṛṣṇa-kathā . This is the silence of Mahārāja Ambarīṣa:
sa vai manaḥ kṛṣṇa-padāravindayor  
 vacāmsi vaikuṇṭha-guṇānuvarṇane
“King Ambarīṣa always fixed his mind on the lotus feet of the Lord and talked of Him only.” ( Bhāg.  9.4.18) We should also take this opportunity