Sometimes atheists argue that since God is invisible to their eyes, they do not believe in God. For them the Supreme Lord is describing a method by which one can see God in His impersonal form. Intelligent persons can see God in His personal form, as stated in the śāstras, but if one is very eager to see the Supreme Personality of Godhead immediately, face to face, he can see the Supreme Lord through this description, which portrays the various internal and external parts of His body.
(Srimad Bhagavatam----6:4:46----purport).

It is only on the bhakti platform that one can understand the Supreme Personality of Godhead Kṛṣṇa and His transcendental name, form, qualities, pastimes and entourage. Being thus qualified spiritually, one is allowed to enter the spiritual kingdom of God and return home, back to Godhead.
(Sri Caitanya Caritamrta----2:17:137----purport).

Since Kṛṣṇa's transcendental body, name, form, qualities, pastimes and entourage are all the Absolute Truth, they are as good as Kṛṣṇa Himself.
(Sri Caitanya Caritamrta----2:17:134----purport).

Anyone who knows the appearance and activities of the Supreme Lord Kṛṣṇa is freed from the clutches of material nature and goes back home, back to Godhead. Therefore Kṛṣṇa's transcendental name, form, activities and qualities are not products of this material nature.
(Krsna Book).

Lord Kṛṣṇa and Balarāma are not two different Personalities of Godhead. God is one without a second, but He expands Himself in many forms without their being separate from one another. They are all plenary expansions.
(Srimad Bhagavatam----3:1:26----purport).

The Brahma-saṁhitā (5.29) describes that in the abode of Lord Kṛṣṇa, which is made of cintāmaṇi (touchstone), the Lord, acting as a cowherd boy, is served by hundreds and thousands of goddesses of fortune. Māyāvādīs think that the devotees have imagined the form of Kṛṣṇa, but the authentic Vedic scriptures have actually described Kṛṣṇa and His various transcendental forms.
(Sri Caitanya Caritamrta----3:3:111----purport).

The mind is always flying to this and that, but one must practice concentrating the mind always on the form of the Supreme Lord, Śrī Kṛṣṇa, or on the sound of His name. The mind is naturally restless, going hither and thither, but it can rest in the sound vibration of Kṛṣṇa. One must thus meditate on paramaṁ puruṣam, the Supreme Personality of Godhead in the spiritual kingdom, the spiritual sky, and thus attain Him.
(Bhagavad-Gita--introduction).

Only the pure devotees can know the transcendental name, form and activities of Lord Kṛṣṇa due to their being completely freed from the reactions of fruitive work and mental speculation. The pure devotees have nothing to derive as personal profit from their unalloyed service to the Lord.
(Srimad Bhagavatam----1:3:38----purport).

Simply by chanting and hearing of the transcendental name, form, etc., of the Personality of Godhead, Śrī Kṛṣṇa, one can achieve the cessation of unlimited miserable conditions.
(Srimad Bhagavatam----3:7:14----translation).

Since the name, form, qualities and activities of the Supreme Personality of Godhead, Kṛṣṇa, cannot be understood by the material senses, He is also called adhokṣaja, meaning "beyond sense perception."
(Srimad Bhagavatam----4:29:3----purport).