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The Perfection of Yoga
What is the sign by which we can tell that one has attained perfection in  yoga ? Kṛṣṇa indicates that one is situated in  yoga  when his consciousness is completely under his control.
yadā viniyatam cittam  
 ātmany evāvatiṣṭhate  
 niṣpṛhaḥ sarva-kāmebhyo  
 yukta ity ucyate tadā
“When the  yogī , by practice of  yoga , disciplines his mental activities and becomes situated in Transcendence—devoid of all material desires—he is said to have attained  yoga .” (Bg.6.18) One who has attained  yoga  is not dependent on the dictations of his mind; rather, the mind comes under his control. Nor is the mind put out or extinguished, for it is the business of the  yogī  to think of Kṛṣṇa or Viṣṇu always. The  yogī  cannot allow his mind to go out. This may sound very difficult, but it is possible in Kṛṣṇa consciousness. When one is always engaged in Kṛṣṇa consciousness, in the service of Kṛṣṇa, then how is it possible for the mind to wander away from Kṛṣṇa? In the service of Kṛṣṇa, the mind is automatically controlled.
Nor should the  yogī  have any desire for material sense gratification. If one is in Kṛṣṇa consciousness, he has no desire other than Kṛṣṇa. It is not possible to become desireless. The desire for sense gratification must be overcome by the process of purification, but desire for Kṛṣṇa should be cultivated. It is simply that we have to transfer the desire. There is no question of killing desire, for desire is the constant