Bhagavad Gita Chapter 15 Explained: Purushottama Yoga

Bhagavad Gita Chapter 15, known as Purushottama Yoga or the Yoga of the Supreme Person, is the shortest chapter in the Gita with just twenty verses, yet it contains the essence of the entire Vedantic vision. Krishna uses the striking metaphor of an inverted banyan tree to describe the nature of the world, the individual soul, and the Supreme Reality, culminating in the revelation of Purushottama—the Supreme Person who transcends both the perishable and the imperishable . The chapter moves from cosmology to psychology to theology, showing how the bound soul can sever its roots in samsara and take refuge in the primordial Purusha from whom all existence has sprung . In one line: Chapter 15 reveals the Supreme Person who is the source, support, and ultimate goal of all existence, and the path to that Supreme through non-attachment and knowledge.

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Part 1: The Inverted Tree – The Nature of the World (Verses 1-4)

The Ashvattha Tree

Krishna opens the chapter with a profound metaphor:

“They speak of the immutable Ashvattha tree, with its roots above and its branches below, whose leaves are the Vedas. He who knows it is the knower of the Vedas.” (15.1)

The Ashvattha is the banyan tree, and the universe is described as an inverted tree. The word ashvattha can be derived as a + shwa + ttha, meaning “not tomorrow”—that which does not remain the same tomorrow, indicating the ever-changing nature of the universe .

The Symbolism of the Tree

Element	Meaning
Roots above	The Supreme Reality, the source from which all existence springs
Branches below	The manifested universe, extending downward into matter
Leaves	The Vedic hymns, which nourish and sustain the tree
Branches nourished by gunas	The three qualities of Nature (sattva, rajas, tamas) that sustain the tree
Sprouts	The objects of sensory perception
Roots below	The karmic bonds that tie human beings to action and rebirth

The Axe of Non-Attachment

Krishna then reveals the means of liberation:

“The real form of this tree cannot be perceived in this world… It must be cut down with the strong weapon of non-attachment.” (15.3-4)

The tree is deeply rooted (su-virudha-mulam) and cannot be pulled down by ordinary means. The axe is detachment (asanga), sharpened by knowledge and discrimination (jnana-viveka) . One must cut through the tree completely and then seek that goal from which one does not return, taking refuge in the primordial Purusha .

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Part 2: The Bound Soul and Its Journey (Verses 5-11)

The Qualities of Those Who Reach the Goal

Verse 5 describes those who attain the immutable goal:

“Free from pride and delusion, overcoming the evil of attachment, ever devoted to spiritual pursuits, rid of desires and the dual throng named pleasure and pain, the wise go to the immutable goal.”

The liberated one is nirmama (free from pride), nirmoha (free from delusion), jita-sanga-dosha (having conquered the evil of attachment), adhyatma-nitya (ever devoted to spiritual pursuits), and vinivritta-kama (rid of desires).

The Supreme Abode

Verse 6 describes the nature of that goal:

“Neither the sun nor the moon, nor fire can illumine that Supreme Abode of Mine. Having gone There, one does not return to this material world again.”

This is the dhama—the abode of the Supreme—which is self-luminous and beyond all material sources of light. It is the state from which there is no return (na nivartante).

The Eternal Fragment of the Divine

Verse 7 provides one of the most important declarations about the individual soul:

“The embodied souls in this material world are My eternal fragmental parts. But bound by material nature, they are struggling with the six senses including the mind.”

The word amsha (fragment) does not mean the soul is a piece of God in a spatial sense. It means the soul is eternally related to the Divine as a part is related to the whole—distinct in function but non-different in essence.

The Soul’s Journey

Verses 8-9 describe how the soul transmigrates:

“As the air carries fragrance from place to place, so does the embodied soul carry the mind and senses with it, when it leaves an old body and enters a new one.”

“Using the sense perceptions of the ears, eyes, skin, tongue, and nose, which are grouped around the mind, the embodied soul savors the objects of the senses.”

The Blind and the Seeing

Verses 10-11 contrast those who can perceive the soul’s journey and those who cannot:

“The deluded do not perceive him when he departs or stays or experiences, being carried away by the gunas. But those who have the eye of knowledge see him.” (15.10)

“The striving yogis, established in Self-realization, see this clearly. But those not established in Self-realization, even though striving, do not see it.” (15.11)

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Part 3: The Divine Presence in the World (Verses 12-15)

The Source of All Light

Krishna then reveals himself as the source of all illumination:

“The splendor of the sun, which dissipates the darkness of this whole world, comes from Me. And the splendor of the moon and the splendor of fire are also from Me.” (15.12)

The Sustainer of All Life

“I enter into each planet, and by My energy they stay in orbit. I become the moon and thereby supply the juice of life to all vegetables.” (15.13)

The Inner Fire and the Knower

“I am the fire of digestion in the bodies of all living entities, and I join with the air of life, outgoing and incoming, to digest the four kinds of foodstuff.” (15.14)

“I am seated in the hearts of all. From Me come memory, knowledge, and their loss. I am the knowable in all the Vedas. I am indeed the compiler of Vedanta and the knower of the Vedas.” (15.15)

This verse is particularly significant because it declares that Krishna is both the vedanta-krit (compiler of Vedanta) and veda-vit (knower of the Vedas). He is the source of all knowledge and the one who reveals it .

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Part 4: The Three Purushas – Kshara, Akshara, and Purushottama (Verses 16-18)

The Perishable and the Imperishable

Krishna then introduces a profound distinction:

“There are two kinds of beings in this world: the perishable (kshara) and the imperishable (akshara). All created beings are perishable, and the unchanging is imperishable.” (15.16)

Purusha	Nature
Kshara	All mutable beings, from the highest deity to the lowest creature—everything subject to change and destruction
Akshara	The unchanging principle, the imperishable substratum

The Supreme Person

Beyond both is the Supreme:

“But beyond these two there is another, the Supreme Person (Purushottama), who pervades and sustains all the three worlds as the immutable Lord.” (15.17)

“Because I am beyond the perishable and greater than the imperishable, I am known in the world and in the Vedas as the Supreme Person (Purushottama).” (15.18)

The tu (but) in verse 17 distinguishes the Supersoul from both the fallible and the infallible purushas mentioned in verse 16 .

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Part 5: The Fruit of Knowing Purushottama (Verses 19-20)

The Worship of the All-Knowing

“He who, free from delusion, knows Me thus as the Supreme Person, he, the all-knowing, worships Me with his whole being, O Bharata.” (15.19)

The one who knows Purushottama is sarva-vit (all-knowing) because knowing the Supreme means knowing everything that is sustained by Him. Such a person worships with sarva-bhava—with the whole being, in oneness .

The Conclusion

“Thus I have taught this most secret scripture, O sinless one. By understanding this, one becomes wise and fulfilled in life, O Bharata.” (15.20)

Krishna calls this teaching guhyatamam—the most secret of all secrets. It is a shastra (scripture) in itself. Understanding it makes one truly wise (buddhiman) and fulfilled (krita-kritya) .

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Common Questions

Q1: What is the meaning of the inverted tree metaphor?
The inverted Ashvattha tree represents the universe. The roots above signify the Supreme Reality as the source; the branches below represent the manifested world; the leaves are the Vedic hymns that nourish it. The tree must be cut with the axe of non-attachment to attain liberation .

Q2: What are the three Purushas in Chapter 15?
The three are: Kshara Purusha (the perishable—all mutable beings), Akshara Purusha (the imperishable—the unchanging substratum), and Purushottama (the Supreme Person beyond both). The individual soul is a fragment of Purushottama, eternally related to the Divine .

Q3: What does it mean that the soul is an “amsha” (fragment) of God?
It means the soul is eternally related to the Divine as a part is to the whole—distinct in function but non-different in essence. The jiva is sanatana (eternal), not a temporary creation .

Q4: How does one cut the tree of samsara?
Through asanga (non-attachment) sharpened by jnana-viveka (knowledge and discrimination). One must sever the roots of karmic bondage and seek refuge in the primordial Purusha .

Q5: Why is this chapter considered the essence of the Vedas?
Krishna declares that He is the compiler of Vedanta and the knower of the Vedas (15.15). The chapter synthesizes the Vedic vision: the nature of the world (tree), the nature of the soul (fragment), the nature of God (Purushottama), and the path to liberation (non-attachment and knowledge) .

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Summary

Bhagavad Gita Chapter 15, Purushottama Yoga, presents the essence of Vedanta in twenty verses. Using the metaphor of the inverted Ashvattha tree, Krishna describes the world as a temporary, ever-changing manifestation rooted in the Supreme. The individual soul is an eternal fragment of the Divine, struggling in material nature due to ignorance. Beyond the perishable (kshara) and the imperishable (akshara) is Purushottama—the Supreme Person who pervades and sustains all. Knowing this Supreme Person, free from delusion, one becomes all-knowing and worships the Lord with one’s whole being. This is the most secret of all teachings, and understanding it makes one wise and fulfilled. That realization—that the Supreme Person is the source, support, and goal of all existence, and that you are an eternal fragment of that Supreme—is the gift of Purushottama Yoga.

Om Shanti Shanti Shanti