Only the pure devotees can know something of the inconceivable transcendental qualities in Kṛṣṇa—His being the cause of all causes, His omnipotence and opulence, and His wealth, fame, strength, beauty, knowledge and renunciation—because Kṛṣṇa is benevolently inclined to His devotees. He is the last word in Brahman realization, and the devotees alone can realize Him as He is. Therefore it is said:
ataḥ śrī-kṛṣṇa-nāmādi
na bhaved grāhyam indriyaiḥ
sevonmukhe hi jihvādau
svayam eva sphuraty adaḥ
(CC.2:17:136)
"No one can understand Kṛṣṇa as He is by the blunt material senses. But He reveals Himself to the devotees, being pleased with them for their transcendental loving service unto Him." (Bhakti-rasāmṛta-sindhu 1.2.234)

(Bhagavad-Gita-------7:3-------purport).

"No one can understand Kṛṣṇa as He is by the blunt material senses. But He reveals Himself to the devotees, being pleased with them for their transcendental loving service unto Him." (Bhakti-rasāmṛta-sindhu 1.2.234)
bhaktyā mām abhijānāti
yāvān yaś cāsmi tattvataḥ
tato māṁ tattvato jñātvā
viśate tad-anantaram
"One can understand the Supreme Personality as He is only by devotional service. And when one is in full consciousness of the Supreme Lord by such devotion, he can enter into the kingdom of God." (B.G.18:55)

(Srimad Bhagavatam-------7:7:17-------purport).

Bhakti-rasa itself is sufficient to produce a feeling of liberation, because it attracts the attention of the Supreme Lord, Kṛṣṇa. Generally, neophyte devotees are anxious to see Kṛṣṇa, or God, but God cannot be seen or known by our present materially blunt senses. The process of devotional service as it is recommended in The Nectar of Devotion will gradually elevate one from the material condition of life to the spiritual status, wherein the devotee becomes purified of all designations.

(Nectar of Devotion).