Associating with Kṛṣṇa
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that he shall not forget Him and that he will always be able to engage in His transcendental service. These are symptoms of pure devotion. Of course a devotee, wherever he is, remains in the spiritual kingdom, even while in this material body. But he does not demand anything from God for his own personal elevation or comfort.
Although Śrī Kṛṣṇa indicates that He can be easily reached by one who is devoted to Him, there is an element of risk involved for the  yogīs  who practice other methods of  yoga . For them, He has given directions in  Bhagavad-gītā  regarding the proper time to leave the gross body.
yatra kāle tv anāvṛttim 
    āvṛttīm caiva yoginaḥ 
    prayātā yānti taṁ kālaṁ 
    vakṣyāmi bharatarṣabha
“O best of the Bhāratas, I shall now explain to you the different times at which, passing away from this world, one does or does not come back.” (Bg. 8.23)
Here Kṛṣṇa indicates that if one is able to leave his body at a particular time, he can become liberated, never to return to the material world. On the other hand, he indicates that if one dies at another time, he has to return. There is this element of chance, but there is no question of chance for a devotee always in Kṛṣṇa consciousness, for he is guaranteed entrance into the abode of Kṛṣṇa by dint of his devotion to the Lord.
agnir jyo tir ahaḥ śuklaḥ 
    ṣaṇ-māsā uttarāyaṇam 
    tatra prayātā gacchanti 
    brahma brahma-vido janāḥ