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THE SCIENCE OF SELF-REALIZATION
In the present age, however, if you want success in practical yoga, take to the chanting of Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, and feel for yourself how you are making progress. One should know for himself how much he is progressing in yoga practice.
In the  Bhagavad-gītā  this practice of Kṛṣṇa consciousness is described as  rāja-vidyā , the king of all erudition;  rāja-guhyam , the most confidential system of spiritual realization;  pavitram , the purest of all that is pure;  susukham , very happily performed; and  avyayam , inexhaustible.
Those who have taken to this most sublime  bhakti-yoga  system, this practice of devotional service in transcendental love of Kṛṣṇa, can testify to how they are nicely enjoying its happy and easy execution. Yoga means controlling the senses, and  bhakti-yoga  means purifying the senses. When the senses are purified, they are also, automatically, controlled. You cannot stop the activities of the senses by artificial means, but if you purify the senses not only are they kept back from rubbish engagement, but also they become positively engaged in transcendental service to the Lord.
Kṛṣṇa consciousness is not manufactured by us through mental speculation. It is prescribed in the  Bhagavad-gītā , which says that when we think in Kṛṣṇa, chant in Kṛṣṇa, live in Kṛṣṇa, eat in Kṛṣṇa, talk in Kṛṣṇa, hope in Kṛṣṇa, and sustain in Kṛṣṇa, we return to Kṛṣṇa without any doubt. And this is the substance of Kṛṣṇa consciousness.