There are many verses in the Vedas giving references to who can see Krishna , seeing Krishna directly, or seeing Him through His energies . The mother sees and remembers her child just by seeing the child’s shoes , and sometimes very deep memories occur of things they did together, so in union with the child or in separations the mother sees the child .
One who has not developed love can not have separation within the heart, nor will they see the object of their love in other objects .
BHAGAVAD GITA..
Verse 24 chap.7
avyaktaṁ vyaktim āpannaṁ manyante mām abuddhayaḥ
paraṁ bhāvam ajānanto mamāvyayam anuttamam [1]
Meaning: “Unintelligent men, who do not know Me perfectly, think that I, the Supreme Personality of Godhead, Krishna, was impersonal before and have now assumed this personality. Due to their small knowledge, they do not know My higher nature, which is imperishable and supreme.”
This verse indicates those who think God is an impersonal energy, when Krishna comes they think his form is made of matter and He has a body like theirs , thus the minimise His actions thinking they are material and ultimately illusory.
Such persons can not connect this world or Krishna’s pastimes to spiritual personal realisations of Divinity.
Verse 25
nāhaṁ prakāśaḥ sarvasya yoga-māyā-samāvṛtaḥ
mūḍho ‘yaṁ nābhijānāti loko mām ajam avyayam [1]
Meaning: “I am never manifest to the foolish and unintelligent. For them, I am covered by My internal potency (yoga-māyā), and therefore they do not know that I am unborn and infallible.”
This verse says what amounts to similar” unthinking ” by the doubting person, that Krishna and His energies are material and have no place in spirituality . Within the organisation of matter , which is an inferia energy of Krishna, but spiritual , because it originates in the spiritual, Krishna can be seen . When Krishna was present, the unthinking and unloving saw him as an ordinary person, His Godhood was not in their vision or heart due to lack of love and envy of His superior nature. Similarly, the perfect math symmetry and design in everything around us within nature is ignored by those who have not developed love for God .
Krishna says further in the Bhagavad Gita.
“For one who sees me everywhere and sees everything in me, i am never lost nor is he ever lost to me”
These exact words reflect a famous spiritual truth from Bhagavad Gita Chapter 6, Verse 30. Spoken by Lord Krishna, it describes the profound, unbroken bond a self-realized soul shares with Him , in different ways according to one’s level of devotion. An individual perceives the divine presence in all beings and within nature , he sees and recognizes that all beings exist within the Divine, self evident truths of the equality of all beings is clear .The more one loves God, the more is seen . In topmost levels of love of Godthey are never separated from the Divine, nor is the Divine ever separated from them.
This is indicated by this verse .
Śrī Brahma-saṁhitā 5.38
premāñjana-cchurita-bhakti-vilocanena
santaḥ sadaiva hṛdayeṣu vilokayanti
yaṁ śyāmasundaram acintya-guṇa-svarūpaṁ
govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
Translation
I worship Govinda, the primeval Lord, who is Śyāmasundara, Kṛṣṇa Himself with inconceivable innumerable attributes, whom the pure devotees see in their heart of hearts with the eye of devotion tinged with the salve of love.
How to get this love is taught by Sri Caitanya Mahaprabhu , He taught the science and methods to Srila Rupa Goswami , Srila Sanatana Gosvami , Srila Jiva Goswami , and Srila Ragganatha das Goswami. The param para acaryas write and teach following them .Srila AC Bhaktivedanta Swami has widely written on all these topics and these books are in every language.