Lord Kṛṣṇa says:
Now listen Arjuna, how one can have full knowledge of Me without any doubts, by dedicating his yoga practise to Me, and absorbing his mind on Me.

I will explain this knowledge to you fully, along with the process of its immediate realisation. Once you understand this, there is nothing else that needs to be known.

Among thousands of men, perhaps one strives for perfection; even among those who strive for perfection, only one may know Me; and among those who know Me, maybe one alone knows Me in truth.

Earth, water, fire, air, ether, mind, intellect, and the ego; make up the eight parts of My material nature.

This is My lower nature. But, Arjuna, know that My higher nature is different. It is made up of the embodied souls, which sustain this universe.

Know that all beings originate from these two natures of mine. Understand therefore that I am the origin and the dissolution of this whole universe.

There is nothing higher than Me, O Arjuna. All of this rests upon Me, like pearls on a thread.

I am the taste of water; I am the radiance of the Sun and Moon. I am the sacred syllable oṁ in the Vedas; I am the sound in ether, and the valour in men.

I am the fragrance of the earth; I am the heat of fire; I am the life of all living beings, and the austerity of ascetics.

Know Me, Arjuna, to be the original seed of all beings. I am the intelligence of the intelligent, and the energy of the energetic.

O Arjuna, I am the strength of the strong which is without passion and desire. I am that desire in all living beings which does not go against righteous principles.

Know that all the states of sattva, rajas, and tamas have their origin in Me alone. But I am not in them; they are in Me.

The entire universe is deluded by these three conditions originating from the guṇas, and fails to recognize Me, who is unchanging and beyond.

For this divine māyā of Mine consisting of the three guṇas is hard to overcome. But those who take refuge in Me alone, cross over it easily.

But the unrighteous, the foolish, the lowest of people, those whose wisdom has been stolen away by māyā and those who have taken the nature of demons, do not seek refuge in Me.

Four types of devotees worship Me, O Arjuna: The distressed, the seekers of knowledge, those who desire wealth, and the jñānī who truly has knowledge.

Of these, the jñānī who is steadfast and ever-devoted is the best. I am very dear to him and he is dear to Me.

Those who approach Me are all noble people, but I see the jñānī as My very Self, for such a person is steady and exclusively devoted to Me as the highest goal.

At the end of many births, the one who has true knowledge surrenders to Me, realizing that ‘Kṛṣṇa is everything’. Such a person is very rare.

Enslaved by their inherent nature, and deprived of insight by various desires, the worldly-minded turn to other demigods, observing various disciplines.

Understand that whichever manifestation of a demigod any devotee desires to worship with faith, it is I that makes that faith unshakeable and firm.

Endowed with that faith, one engages in the worship of a particular demigod, obtaining their desired objects, but these objects are in fact given by Me alone.

But the reward gained by these people of limited understanding is temporary. The worshippers of the demigods will go to the demigods, but My devotees will come to Me.

Not knowing My higher nature as imperishable and supreme, the ignorant think of Me as an impersonal being who has now become manifest.

I do not reveal Myself to everybody, but I cover Myself with My yogamāyā. This deluded world does not recognize Me as unborn and infallible.

O Arjuna, I know all the beings that have come before, that are here now, and those that have yet to come; but no one knows Me.

Bewildered by the pairs of opposites, Arjuna, which arise from desire and aversion, all beings are born into delusion.

But those who perform virtuous deeds, whose sins have ceased, are freed from the illusion of the pairs of opposites. They worship Me, steadfast in their determination.

Those who take refuge in Me and strive for liberation from old age and death, fully understand Brahman, adhyātma, and karma.

And those who know Me in relation to the adhibhūta, adhidaiva, and the adhiyajña, they too with their minds fixed, can know Me even at the hour of death.