Bhagavad Gītā Chapter 9, Verse 19: Krishna to Arjuna — Rāja-Vidyā-Rāja-Guhya-Yoga

Bhāṣyakāra purports

• Śaṅkaraadvaita

  Śaṅkara reads the verse as Īśvara's own declaration that every cosmic function—heat, rain withheld, rain released—belongs to the one undivided Brahman appearing as Āditya. 'Amṛta' (nectar, immortality) and 'mṛtyu' (death) are not two realities but two faces of the same power; 'sat' (the manifest, causally present) and 'asat' (the unmanifest, absent to a given locus) are likewise not absolute opposites but relational designations within Māyā. Bhagavān is not absolutely non-existent (asat) in the ultimate sense; rather, kārya (effect) and kāraṇa (cause) are themselves the sat-asat pair, both resolved into the one Brahman.

• Rāmānujaviśiṣṭādvaita

  Rāmānuja reads every predicate—tapa (heat), varṣa-nigrahaṇa (withholding rain), varṣa-utsarga (releasing rain), amṛta, mṛtyu, sat, asat—as Bhagavān affirming that the entire universe of cit (conscious beings) and acit (matter) constitutes His body (śarīra), and He is their inner Self (antaryāmin) in every state. 'Sat yad vartate, asat yad atītam anāgataṃ ca': present things are sat, past-and-future are asat—all three temporal modes of the world-body are His modes (prakāra). The verse is not cosmological catalogue but the philosophical ground for the mahātmā's upāsanā: knowing this śarīra-śarīrin unity, they worship Him as the one reality running through every form.

• Madhvadvaita

  Madhva uses 9.19 to press the sat-kārya / asat-kāraṇa distinction drawn from Bhārata: the manifest effect is called sat because it has become explicit (abhivyakta-rūpa); the unmanifest cause is called asat because it remains implicit (avyakta-rūpa). Hari alone is the agent of both manifestation and dissolution, and the verse climaxes in 'yad viśvaṃ sad-asataḥ param'—Hari transcends even the sat-asat polarity. This 'beyond' is Madhva's signature move: Brahman is not identified with the world-pair but remains sovereignly distinct and superior to it as its independent cause.

• Vallabhaśuddhādvaita

  Vallabha locates the verse in the Pañcāgnividyā sequence: Bhagavān as Sūryātman draws moisture (varṣa-nigrahaṇa) for eight months and releases rain (varṣa-utsarga) for four, generating the grain that makes yajña possible—so His very cosmic action is prasāda channeled into sṛṣṭi (creation). Amṛta is life itself; mṛtyu is the withdrawal of that rain. Sat-asat are then dissolved into the Brahma-vāda declaration: 'sarvam brahma eva aham'—the entire manifest-unmanifest world is nothing but Kṛṣṇa's own svarūpa. For the bhakta in Puṣṭi-mārga, the verse reveals that even the physical seasons are Kṛṣṇa's līlā-prasāda; to eat the food that rain grows is to receive grace directly.

• Śrīdharabhakti

  Śrīdhara reads the verse simply and devotionally: abiding as Āditya, Bhagavān heats the world in summer (nidhāgha-samaye tapāmi), releases rain in the monsoon (varṣam utsṛjāmi), and at other times withholds it (varṣaṃ nigṛhṇāmi). Amṛta is jīvana (life-sustaining), mṛtyu is nāśa (cessation). Sat is the gross-visible (sthūla-dṛśya), asat is the subtle-invisible (sūkṣma-adṛśya). All of this is 'aham eva'—and recognizing this, the wise worship Him in His many forms (bahu-dhā upāsate), which ties directly back to the preceding verse's theme of the mahātmā's multiform adoration.

• Madhusūdanaadvaita-bhakti

  Madhusūdana synthesizes: as Āditya, Bhagavān draws the earth's moisture through solar rays for eight months (nigrahaṇa) and returns it as rain for four (utsarga). Amṛta is both the nectar of the devas and the life-principle of all beings; mṛtyu is their destruction. Sat is whatever exists in relation to a given locus; asat is whatever does not—both are Bhagavān. The philosophical point is ultimately Advaitic (sarva-ātmānaṃ māṃ viditvā), but the devotional conclusion is that knowing this all-pervading identity, the practitioner worships according to their own adhikāra (sva-sva-adhikārānusāreṇa)—Jñāna and Bhakti are not competing paths but calibrated modes of approaching the same sarvātman.