Vibhuti Pada 3.40 — Mastery of Samāna: Radiance

By mastery of the equalising breath, there is radiance.

Unpacking the Sanskrit compound

This is among the briefest sūtras of the chapter, and every word counts. The condition is samāna-jayāt, "from the mastery of samāna." Samāna means "equal, even, balancing" (from sam, "together, equally," with the breath-root an, "to breathe") — the equalising vital air, seated in the region of the navel, that distributes and balances the body's energies and tends the digestive fire. Jaya is mastery or conquest (from ji), and the ablative -āt marks it as cause. The single-word result is jvalanam, from the root jval, "to blaze, to flame, to shine" — blazing, flaming, radiance, a kindling into brilliant light. So: from mastery of the equalising breath, radiance.

The economy of the verse is striking even by the compressed standards of the sūtra form: a single compound for the cause and a single word for the effect, with no connecting verb. This brevity is itself expressive, for the relation between the equalising breath and radiance is treated as nearly self-evident once the inner physiology is granted — tend the central fire, and it shines. The very word jvalana is, in other contexts, simply a name for fire itself, the blazing thing; so the result-word already contains the element whose mastery produces it. There is a quiet elegance in naming the fruit of the fire-tending breath with a word that means "the blazing one." Cause and effect are bound at the level of vocabulary, the way mastered fire and shed light are bound in fact.

What the sutra asserts

This brief sūtra names a second of the vital airs and its fruit. Samāna is the equalising or balancing breath; it governs assimilation, the distribution of energy, and the kindling of the body's central heat — the agni at the navel that transforms food into vitality. By mastery of this breath, the tradition holds, the practitioner takes command of that central fire, and the fire mastered is said to blaze: the body of the accomplished yogi becomes radiant, luminous, suffused or surrounded by light. The classical commentaries describe a literal effulgence as the fruit of the equalised breath.

The connection is intuitive within the inner physiology. Because samāna tends the digestive fire, mastering it is mastering the body's central heat, and the natural image of mastered fire is light. As throughout this pāda, the register stays descriptive: Patañjali states what mastery of the equalising breath is said to yield, neither demonstrating the radiance nor debunking the claim, presenting it as the tradition's account of the fruit of the conquered central fire.

It is worth dwelling on why the fruit is light rather than heat. An untended or disordered fire scorches, smokes, and consumes; a fire that is balanced and well-fed burns clean and gives light. Samāna, the equalising air, is precisely the principle of balance and even distribution, so its mastery does not stoke the fire into a destructive blaze but brings it to the steady, luminous burning that radiates. The tradition's claim is therefore not that the yogi becomes hot or feverish but that the central fire, perfectly governed, manifests as effulgence — the body shining with a light that is the sign of an inner combustion under complete and even control. Radiance, in this account, is the visible signature of balance, not of intensity.

The place in the pada's argument

This sūtra completes the short pair on mastery of the vital airs begun in the previous verse. Where 3.39 named the upward breath (udāna) and its fruits of non-adhesion and ascent, 3.40 names the central, equalising breath (samāna) and its fruit of radiance. Together they show the method of the vibhūti-pāda at this stage: a systematic survey of what mastery over each vital energy is held to yield. All of it remains under the warning of 3.37 — these are attainments mapped, not goals to chase. The sequence on the airs gives way, further on, to the powers over the senses, the elements, and the body, of which the radiance named here is a kind of foretaste, the inner fire beginning to shine before the larger masteries of prakṛti are taken up.

The pairing of udāna and samāna across these two sūtras has its own quiet logic. Udāna is the upward, outward-rising air, and its mastery confers lightness and ascent — a movement away from the dense and the mired. Samāna is the central, gathering, equalising air, and its mastery confers radiance — a shining forth from the stabilized centre. The two together describe complementary movements of the mastered vital force: the one lifting and freeing, the other centring and illuminating. Patañjali names the rising air first and the centring air second, so that the sequence moves from buoyant ascent to luminous balance, from the freedom that escapes the heavy to the radiance that pours from a settled core. Read as a pair, they sketch a being both unweighted and aglow.

The commentary tradition

Vyāsa, in the Yoga-Bhāṣya, identifies samāna among the five airs, locates its seat and function in the kindling and balancing of the bodily fire, and explains that its mastery causes that fire to blaze, so that the yogi becomes effulgent. Vācaspati Miśra, in the Tattva-vaiśāradī, elaborates the physiology — how samāna fans the digestive and bodily heat and how its conquest intensifies that fire into manifest radiance. Vijñānabhikṣu sets the teaching within the broader account of prāṇa and the elemental fire, stressing the coherence of the inner physiology in which the equalised breath governs the very heat that, intensified, becomes luminous. Bhoja, in the Rājamārtaṇḍa, gives a concise reading consistent with these. The commentators agree that the radiance is the natural fruit of the mastered central fire, and several note that radiance here is light born of balance rather than of burning — the even fire shining rather than consuming.

The symbolic reading

Read symbolically, the sūtra names something often observed: that a person of well-ordered, balanced vitality has a kind of radiance, an evident inner light. That radiance should be the fruit of mastering the central, equalising breath carries a fine logic. Samāna balances and distributes; its very name means "equal" and "even." When the body's energies are perfectly balanced and the central fire well-tended, the result is not heat that burns but light that shines. Radiance, in this account, is the natural emanation of a being whose vital energies are equalised and whose inner fire is steady and bright rather than scattered or consuming. We speak of people who "glow," who seem lit from within; the sūtra locates the source of such luminosity in the equalised, well-tended fire at the centre of the being — and so makes radiance a fruit not of intensity but of balance.

The placement of the source at the navel is itself meaningful. The centre of the body, neither the head with its thought nor the heart with its feeling, is named as the seat of the fire whose mastery makes one shine. This locates radiance not in the cultivation of any single faculty but in the right ordering of the whole vital economy, gathered and balanced from its physical middle. A being radiant in this sense is not one of unusual brilliance of mind or warmth of heart alone but one whose energies are integrated and evenly distributed from the core outward. The teaching quietly resists the notion that luminosity is a special gift of the few; it presents it instead as the natural overflow of a well-ordered vitality, available wherever the central fire is tended with the evenness that samāna embodies. What shines, in the end, is balance itself.

The radiant body of the holy

The radiance of the realized being is among the most universal of spiritual signs. The shining face of Moses descending from Sinai, the Transfiguration in which Christ's body blazed with light, the golden bodies and luminous auras of Buddhas and bodhisattvas in iconography across Asia — all give the same testimony that advanced spiritual attainment manifests as visible radiance. This sūtra's jvalana, the blazing of the one who has mastered the central fire, belongs to this widely shared vision of holiness as luminosity, expressed in halo and nimbus across the religious art of the world.

The sacred inner fire

The image of the sacred inner fire that, well-tended, shines forth has deep roots. The Vedic reverence for Agni as the divine presence in the flame, the Zoroastrian keeping of the sacred fire, and the perpetual lamps maintained in temples across cultures all draw on the intuition that fire is divine presence and that the centre of a being is a fire that can be kindled into radiance. The figure of the holy person as a lamp or a light to others — "a city set on a hill," "the light of the world" in the Gospel of Matthew — extends the same symbolism. The yogic tending of samāna to produce jvalana is a precise physiological version of this widespread reverence for the inner flame.

The everyday glow of vitality

The everyday recognition that vitality and inner balance produce a visible glow is itself a humble witness to this teaching. We speak of someone "radiant" with health or joy, "glowing" with well-being, "lit up" from within. The link between balanced inner energy and outward luminosity that this sūtra names — radiance as the overflow of an equalised central fire — is felt and spoken of across cultures, even where the inner physiology of the vital airs is unknown. The metaphor is so natural that it has worn into ordinary speech.

Beyond any literal effulgence, this sūtra names a truth we recognize easily: that balanced, well-tended vitality shows as a kind of radiance. People whose energy is ordered and whose inner fire burns steady rather than scattered have a presence that is felt — they seem lit from within, and others are warmed by it. The sūtra locates the source of this glow in the equalising of one's energies and the steady tending of one's central fire.

The practical teaching is that radiance is not added from outside but kindled from within by balance. A life whose energies are squandered, scattered, or consumed by inner friction grows dull; a life whose vitality is gathered, balanced, and well-directed grows bright. To tend one's inner fire — neither letting it gutter through depletion nor letting it consume through excess, but keeping it steady and even — is to become a source of warmth and light to those around one. The glow follows the balance.

Depletion masked by stimulation

Modern life tends to deplete and scatter vitality — through chronic stress, poor rest, and the constant fragmentation of attention — leaving many people dull, drained, and lit only by the screens they stare into. This sūtra's teaching that radiance arises from a balanced, well-tended inner fire stands as a quiet rebuke to a culture that exhausts its vitality and then tries to fake the glow cosmetically.

Tending the inner fire

The applicable wisdom concerns the tending of one's vital energy: protecting rest, balancing exertion with recovery, attending to the digestive fire through how and what one eats, and refusing to let attention and energy be endlessly scattered. The samāna, the equalising principle, points to balance as the source of vitality, and balanced vitality is what actually makes a person glow.

The light that cannot be faked

In an age of depletion masked by stimulation, the patient cultivation of genuine, balanced energy is what produces the inner light that no amount of stimulation can counterfeit. The sūtra reframes radiance as a fruit of inner order rather than outer enhancement — a glow that follows from how one tends one's vitality, not from what one applies to the surface.