Approaching Kṛṣṇa, the All-Pervading Truth
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conception of Vāsudeva, and therefore Kuntīdevī points out, “That Vāsudeva, the all-pervading, is Kṛṣṇa.”  Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe ‘rjuna tiṣṭhati:  Kṛṣṇa, the Supreme Lord, is present in everyone’s heart. Thus He is all-pervading.
Kṛṣṇa, the original person, exists in three features: as the Supreme Personality of Godhead, as the all-pervading Paramātmā (the Supersoul), and as the impersonal Brahman effulgence. Those who are interested in  bhakti-yoga  have no interest in the impersonal Brahman effulgence, which is for common men. If one were an inhabitant of the sun, what interest would he have in the sunshine? That would be most insignificant for him. Similarly, those who are advanced in spiritual life are not interested in the impersonal Brahman effulgence. Rather, they are interested in  puruṣa , the Supreme Person, Vāsudeva. As stated in  Bhagavad-gītā , this realization of the Supreme Person takes place after many, many births ( bahūnāṁ janmanām ante ). The  jñānīs , the impersonalists, who are attached to the Brahman effulgence, try to understand the Absolute Truth by dint of their knowledge, but they do not know that their knowledge is imperfect and limited whereas Kṛṣṇa, the Absolute Truth, is unlimited. We cannot approach the unlimited by our limited knowledge. That is not possible.
By the grace of devotees like Kuntīdevī, we can understand that the all-pervading Absolute Truth, Vāsudeva, Paramātmā, is present as Kṛṣṇa ( kṛṣṇāya vāsudevāya ). This realization of Vāsudeva is not possible for impersonalists very easily. Kṛṣṇa says in  Bhagavad-gītā  (7.19):
bahūnāṁ janmanām ante jñānavān māṁ prapadyate vāsudevaḥ sarvam iti sa mahātmā sudurlabhaḥ
“After many births and deaths, he who is actually in knowledge surrenders unto Me, knowing Me to be the cause of all causes and all that is. Such a great soul is very rare.” The word  mahātmā  means “broad-minded.” One who cannot understand Kṛṣṇa is not broad-minded but cripple-minded. If one becomes broad-minded, then by the grace of Kṛṣṇa one can understand Kṛṣṇa.
The process of understanding Kṛṣṇa is  sevonmukha —by rendering service.  Sevonmukhe hi jihvādau . Realization of Vāsudeva is possible by rendering service, beginning with the tongue. The tongue has two functions—to vibrate and to taste. So if one repeatedly hears and vibrates the