Lord Kṛṣṇa says:
Arjuna because you are without envy, I shall reveal to you the most secret of all knowledge, along with the process of its immediate realisation, knowing which you shall be freed from the miseries of life.

This is the king of wisdom, the king of mysteries and the purest of knowledge. It grants direct experience of the Truth, it is based on dharma, it is easy to practise and is unfading.

Those who have no faith in this path, O Arjuna, remain in this cycle of birth and death without ever attaining Me.

This entire universe is pervaded by Me, in My unmanifest form. All beings are in Me, but I am not in them.

And yet these beings are not in Me, such is My divine Mystery! I am the upholder of all beings and yet I am not in them. It is My will alone that causes their existence.

As the mighty wind moves everywhere, but always remains in space, in the same way you should understand how all beings rest in Me.

All beings, Arjuna, are withdrawn into My prakṛti [1] at the end of a cycle of time, and at the beginning of a new cycle, I send them forth again.

Using this prakṛti of Mine, I repeatedly send forth this multitude of beings. They are helpless, being under the control of prakṛti.

But these actions do not bind Me, Arjuna, for I am detached from them, remaining always indifferent.

It is because of Me alone that this prakṛti produces all the moving and non-moving beings. It works under My direction, hence why the world exists as it does.

Fools disregard Me, appearing in a human form, not knowing My divine nature, as the Supreme Lord of all beings.

The hopes, the actions and the knowledge of these foolish people are in vain. Being utterly deluded, they take on the nature of Asuras and Rākṣasas.

But the great souls, O Arjuna, share My divine nature. They adore Me, with a single mind, knowing Me to be the unchanging source of all beings.

Constantly glorifying Me, taking up vows and bowing down before Me in devotion, they always engage in acts of worship.

There are also others who make offerings in the sacrifice of knowledge. They worship Me as the One Being that has manifested in a variety of forms, with faces in different directions.

I am the ritual; I am the sacrifice; I am the offerings made to the ancestors; I am the herbs; I am the mantra; I alone am the clarified butter; I am the fire; I am the offering itself.

I am the Father, Mother, Support and Grandfather of this universe. I am the object of knowledge; I am the Purifier. I am the syllable oṁ and also the Ṛg Veda, Sāma Veda and the Yajur Veda.

I am the Goal, the Supporter, the Lord, the Witness, the Abode, the Refuge and the Friend of the universe. I am creation, destruction and the basis of everything. I am that which is preserved and the eternal seed.

O Arjuna, I am the one who gives heat; I send forth and hold back the rains; I am immortality as well as death; I am the manifest and the unmanifest.

Those who are versed in the three Vedas, being purified from sin by drinking the soma juice, pray for heaven and worship Me with sacrifices.
After reaching that place where the king of the demigods resides, they enjoy celestial pleasures.

Having enjoyed this vast realm of heaven, once their merit is exhausted, they return to the world of mortals.
As a result, those who follow the Vedic rituals and are motivated by desire, go to heaven temporarily before coming back.

But then there are those who adore Me alone with undeviating concentration. For those who yearn for Me in this way, I Myself take charge of their prosperity and welfare.

Understand, Arjuna, that even those who worship other demigods with faith, actually worship Me alone but in an improper way.

For I alone am the enjoyer and the Lord of all sacrifices. But such people do not recognise Me in My true nature, hence they fall from the positions they attain.

Those who worship the demigods, go to the demigods.
Those who worship the ancestors will go to the ancestors.
Those who worship the spirits will reach them.
But My devotees will come to Me.

Whoever offers to Me, with devotion, a leaf, a flower, a fruit or some water, I accept this offering made with devotion by one who is pure of heart.

Whatever you do, whatever you eat, whatever you offer in sacrifice, whatever you give away, whatever austerity you practise, O Arjuna, do it as an offering to Me.

With a steadfast mind, engaged in this yoga, you will free yourself from good and bad results which are the bonds of karma. As a result, you will be liberated and you will come to Me.

I am the same to all beings; there is no one hated by Me nor is there anyone I am partial to; but those who worship Me with devotion live in Me and I in them.

If even the most sinful person worships Me exclusively, with devotion, he must be regarded as a saint, for he has rightly resolved.

Quickly such a person becomes righteous and obtains everlasting peace. O Arjuna, let it be declared that My devotee never perishes.

By surrendering to Me, whatever their birth, race, sex, or caste, even those whom society scorns will attain the supreme state.

How much more, then, the brahmanas and royal sages who are pure and devoted to Me! Therefore, having come into this temporary world of suffering, you should worship Me.

Focus your mind on Me, be devoted to Me, offer worship to Me, bow down to Me. Engaging your mind in this way, holding Me as the supreme goal, you will surely come to Me.