Bhagavad Gita 11.32

“Now I am become Death”: the Gita verse Oppenheimer remembered

The line is Bhagavad Gita 11.32. Krishna, in his cosmic form, answers Arjuna with kālo ’smi: I am Time, grown vast, the maker of the worlds’ end. Oppenheimer recalled it on television in 1965, in words that follow his Sanskrit teacher’s choice of Death for kāla.

  • Trinity test, 16 July 1945
  • Recalled on NBC in 1965
  • kālo ’smi: “I am Time”
What Krishna says

कालोऽस्मि लोकक्षयकृत्प्रवृद्धो लोकान्समाहर्तुमिह प्रवृत्तः । ऋतेऽपि त्वां न भविष्यन्ति सर्वे येऽवस्थिताः प्रत्यनीकेषु योधाः ॥

kālo'smi lokakṣayakṛtpravṛddho lokānsamāhartumiha pravṛttaḥ | ṛte'pi tvāṃ na bhaviṣyanti sarve ye'vasthitāḥ pratyanīkeṣu yodhāḥ ||

I am Time, the great destroyer of worlds, here to end all beings. Even without you, the warriors standing in the opposing ranks will not survive.

Bhagavad Gita 11.32

Oppenheimer’s sentence is his own English for half a line of Sanskrit. In Bhagavad Gita 11.32 Krishna answers Arjuna’s frightened question, “Who are you?”, with kālo ’smi lokakṣayakṛt pravṛddhaḥ: I am Time, grown vast, the one who makes the worlds end. The word kāla means time, and time as the force that ends all things, which is why it can also mean death.

The reading came from his teacher at Berkeley, Arthur Ryder, who translated the verse in 1929 as “Death am I”. Most translators before and since have chosen Time. Both choices are on this page, along with what the verse says in its own chapter and how the old Sanskrit commentators read it.

What Oppenheimer said, and when

On 16 July 1945 the first atomic bomb was tested at the Trinity site in the New Mexico desert. Oppenheimer directed the laboratory that built it. The words most people know come from twenty years later. In 1965 NBC broadcast The Decision to Drop the Bomb, a White Paper documentary produced by Fred Freed. In it Oppenheimer recalls the silence after the test, a few people laughing, a few crying, and a line from the Gita coming to mind:

“Now I am become Death, the destroyer of worlds.”J. Robert Oppenheimer, The Decision to Drop the Bomb, NBC, 1965 (transcript)

He introduces the line by saying that Vishnu is trying to persuade the Prince to do his duty and, to impress him, takes on his multi-armed form. He ends by supposing that everyone present thought something like it, one way or another.

An earlier version, and an open question

The sentence was in print long before 1965, in a slightly different form: “I am become Death, the shatterer of worlds.” The historian James Hijiya traced that version to Time magazine in November 1948; Wikipedia’s biography points to a magazine profile of 1949. Robert Jungk’s book Brighter than a Thousand Suns (1958) gives the fullest account, in which two verses pass through Oppenheimer’s mind at the test: first the radiance of a thousand suns (11.12), then, as the cloud rose, the line about Death (11.32). The New York Times reporter William Laurence later wrote that he heard the line from Oppenheimer a few hours after the test, though he left it out of what he published at the time.

So the famous wording is a recollection, told and retold over twenty years. Whether the verse came to him in the instant of the flash, or afterwards as the way he understood what he had seen, the sources cannot settle.

The thousand suns came first

Jungk’s account pairs the line with an earlier verse of the same chapter. Krishna has just given Arjuna divine sight (11.8), and Sanjaya, who narrates the battle to the blind king Dhritarashtra, describes what Arjuna sees:

Bhagavad Gita 11.12

दिवि सूर्यसहस्रस्य भवेद्युगपदुत्थिता । यदि भाः सदृशी सा स्याद्भासस्तस्य महात्मनः ॥

divi sūryasahasrasya bhavedyugapadutthitā | yadi bhāḥ sadṛśī sā syādbhāsastasya mahātmanaḥ ||

If a thousand suns rose together in the sky, their light would still barely match that great being's radiance.

Bhagavad Gita 11.12

Ryder set it in rhyme: “A thousand simultaneous suns / Arising in the sky / Might equal that great radiance, / With that great glory vie.” The image gave Jungk the title of his book.

Sanskrit at Berkeley

Oppenheimer had read Hindu texts in English during the 1920s. By 1933, a young physics professor at Berkeley, he was reading the Gita in Sanskrit with Arthur W. Ryder, who translated Sanskrit poetry into English verse. He wrote to his brother Frank that the Gita was “very easy and quite marvelous”. He kept a worn copy near his desk and gave the book to friends. When Franklin Roosevelt died in April 1945, he quoted a verse from it at the memorial gathering at Los Alamos:

Bhagavad Gita 17.3, quoted at Los Alamos, April 1945

सत्त्वानुरूपा सर्वस्य श्रद्धा भवति भारत । श्रद्धामयोऽयं पुरुषो यो यच्छ्रद्धः स एव सः ॥

sattvānurūpā sarvasya śraddhā bhavati bhārata | śraddhāmayo'yaṃ puruṣo yo yacchraddhaḥ sa eva saḥ ||

O Bharata, each person's trust matches their inner nature. A person is made of trust; whatever trust he holds, that is what he becomes.

Bhagavad Gita 17.3

In 1963, asked by the Christian Century to name the books that had most shaped his outlook, he put the Gita on the list. Ryder’s own translation had come out in 1929 from the University of Chicago Press, in rhymed quatrains. At 11.32 it reads:

Death am I, and my present taskDestruction. View in meThe active slayer of these men;For though you fail and flee,These captains of the hostile hostsShall die, shall cease to be.Arthur W. Ryder, The Bhagavad-Gita (1929), canto 11

Kāla: time, and time as the end of things

The Sanskrit word is kāla. Monier-Williams’s dictionary derives it from kal, to count or calculate, and lists its senses from a fixed point of time, to time in general, to “time (as destroying all things), death”. The Gita uses the word across that whole range. In chapter 10 Krishna says that among those who reckon he is Time, and that he is Time without end. In the very next verse he says he is mṛtyu, death that takes everything.

  • 10.30: time as reckoning

    प्रह्लादश्चास्मि दैत्यानां कालः कलयतामहम् । मृगाणां च मृगेन्द्रोऽहं वैनतेयश्च पक्षिणाम् ॥

    prahlādaścāsmi daityānāṃ kālaḥ kalayatāmaham | mṛgāṇāṃ ca mṛgendro'haṃ vainateyaśca pakṣiṇām ||

    Among the daityas I am Prahlada; among calculators I am Time. Among beasts I am the lion, and among birds I am Garuda.

    Bhagavad Gita 10.30

  • 10.33: time without end

    अक्षराणामकारोऽस्मि द्वन्द्वः सामासिकस्य च । अहमेवाक्षयः कालो धाताऽहं विश्वतोमुखः ॥

    akṣarāṇāmakāro'smi dvandvaḥ sāmāsikasya ca | ahamevākṣayaḥ kālo dhātā'haṃ viśvatomukhaḥ ||

    Among letters I am the letter A. Among compounds I am the dual compound. I am endless time itself, and I am the all-facing sustainer.

    Bhagavad Gita 10.33

  • 10.34: the word for death

    मृत्युः सर्वहरश्चाहमुद्भवश्च भविष्यताम् । कीर्तिः श्रीर्वाक्च नारीणां स्मृतिर्मेधा धृतिः क्षमा ॥

    mṛtyuḥ sarvaharaścāhamudbhavaśca bhaviṣyatām | kīrtiḥ śrīrvākca nārīṇāṃ smṛtirmedhā dhṛtiḥ kṣamā ||

    I am death that takes everything, and the source of all future beings. Among women, I am fame, fortune, speech, memory, intelligence, steadfastness, and forgiveness.

    Bhagavad Gita 10.34

The Gita had a plain word for death and used it a chapter earlier. In 11.32 it chose kāla.

The old commentators read the word through its root. Ramanuja glosses kāla as the one who counts: Krishna has reckoned the end of the lifespans of the kings gathered on the field. Madhusudana Sarasvati, in Shankara’s Advaita school, calls kāla the Supreme Lord joined to his power of action, the one who draws all things back into himself. Shankara, whose commentary is the oldest to survive, reads the line plainly: Time, grown mighty, brings about the end of the worlds, and has set to work here, at this moment, to gather them in.

Death is a fair reading, since time grown vast implies death. Hijiya calls Ryder’s choice “peculiar but defensible”, and notes that Franklin Edgerton’s 1944 translation printed both words, Time and Death. Time is the larger claim. The ending Arjuna dreads is already under way, and it will arrive with him or without him.

Two more words in Oppenheimer’s English are his own. The Sanskrit says asmi, I am, with no “now” and no “become”. “Am become” is an old English perfect, like “I am come”, and it lends the line its weight of something that has just happened. The nearest thing in the Sanskrit is pravṛddhaḥ, grown, swollen to full size.

Five translations, side by side

Oldest to newest, then ours. Each one is in the public domain or our own.

  1. K. T. Telang1882

    I am death, the destroyer of the worlds, fully developed, and I am now active about the overthrow of the worlds.Even without you, the warriors standing in the adverse hosts, shall all cease to be.

    Death, the destroyer of the worlds: six decades before Trinity, and close to Oppenheimer’s words.

    Sacred Books of the East, vol. 8

  2. Edwin Arnold1885

    Thou seest Me as Time who kills,Time who brings all to doom,The Slayer Time, Ancient of Days, come hither to consume;Excepting thee, of all these hosts of hostile chiefs arrayed,There stands not one shall leave alive the battlefield!

    Time, three times over. Arnold reads ṛte ’pi tvām as “except you”.

    The Song Celestial, Project Gutenberg

  3. Annie Besant1905 edition

    Time am I, laying desolate the world,Made manifest on earth to slay mankind!Not one of all these warriors ranged for strifeEscapeth death; thou shalt alone survive.

    Also Time, and also “except you”: Arjuna alone survives.

    The Bhagavad Gita, with Bhagavan Das

  4. Arthur W. Ryder1929

    Death am I, and my present taskDestruction. View in meThe active slayer of these men;For though you fail and flee,These captains of the hostile hostsShall die, shall cease to be.

    The teacher’s Death, which Oppenheimer kept, and “though you fail and flee” for “even without you”.

    The Bhagavad-Gita, University of Chicago Press

  5. Wisdomour translation

    I am Time, the great destroyer of worlds, here to end all beings. Even without you, the warriors standing in the opposing ranks will not survive.

    Time for kāla, and “even without you”, with Shankara and Ramanuja.

    Bhagavad Gita 11.32 on this site

Modern translations by Edgerton, Easwaran, Mitchell, Sargeant and others are still in copyright, so we name them without quoting. Our guide to English translations compares them.

“Even without you” or “except you”?

The second half of the verse divides the translators. Ṛte ’pi tvām can mean “even without you” or “except you”. Telang and Ryder read the first: the warriors will die whether or not Arjuna fights. Arnold and Besant read the second: all will die except Arjuna. The commentators divide the same way. Shankara, Ramanuja, Shridhara and Madhusudana gloss ṛte as vinā, without, and Madhusudana adds that Arjuna’s own part in it counts for nothing. Purushottama, of Vallabha’s school, reads “except you, the one who sees, the one I favour”, and Vallabha allows both. On the main point all of them agree: the ending is already in motion.

Where the verse sits in chapter 11

  1. Arjuna, moved by what Krishna has taught him, asks to see his divine form (11.3 to 11.4).
  2. Krishna gives him divine sight, since ordinary eyes cannot see it (11.8).
  3. Sanjaya describes a radiance like a thousand suns rising at once (11.12).
  4. Arjuna sees arms, mouths and eyes without number, with no beginning, middle or end (11.16).
  5. Shaken, he twice calls the form Vishnu (11.24, 11.30).
  6. He watches Bhishma, Drona, Karna and the sons of Dhritarashtra rushing into its blazing mouths (11.26 to 11.27).
  7. He asks: who are you, in this fierce form? I do not understand what you are doing (11.31).
  8. Krishna answers with 11.32, and goes on in 11.33: they are already slain by me; be only the instrument.
  9. Arjuna, glad and afraid at once, asks to see the familiar four-armed form again, and Krishna returns to his gentle shape and comforts him (11.45 to 11.50).
The next verse, 11.33

तस्मात्त्वमुत्तिष्ठ यशो लभस्व जित्वा शत्रून् भुङ्क्ष्व राज्यं समृद्धम् । मयैवैते निहताः पूर्वमेव निमित्तमात्रं भव सव्यसाचिन् ॥

tasmāttvamuttiṣṭha yaśo labhasva jitvā śatrūn bhuṅkṣva rājyaṃ samṛddham | mayaivaite nihatāḥ pūrvameva nimittamātraṃ bhava savyasācin ||

Therefore, rise and win fame. Conquer your enemies and enjoy a prosperous kingdom. They have already been slain by me; become only the instrument, Arjuna.

Bhagavad Gita 11.33

Oppenheimer’s “multi-armed form” is this vision. Some writers count “Vishnu” as his slip, since the speaker is Krishna. The name fits the scene better than that: Arjuna himself uses it, and in Hindu tradition Krishna is an avatar of Vishnu.

Ramanuja’s note on 11.33 adds a detail the famous line leaves out. The warriors Krishna has already slain are, in his words, those who have done wrong. The verse speaks of a war already declared and of a reckoning already made, and Arjuna is asked to act within it.

What 11.32 says, and what it leaves unsaid

What it says

  • God, in the form Arjuna asked to see, names himself Time grown vast, the maker of the worlds’ end.
  • He has come, here and now, to gather in the warriors on the field.
  • Their end does not wait on Arjuna. With 11.33, he is asked to act as an instrument in what is already decided.

What it leaves unsaid

  • It does not use the Gita’s word for death, mṛtyu, which appears in 10.34.
  • It has no “now” and no “become”. The Sanskrit is “I am”.
  • It is spoken by Krishna to Arjuna, in answer to a direct question. No human speaker claims it for himself.
  • It offers no praise of destruction. The chapter closes with Arjuna asking for the gentle form, and Krishna giving it.

Why it stayed with him

Hijiya argues that Oppenheimer took three ideas from the Gita: that a person has a duty to do, that he should do it without clinging to its results, and that devotion matters most of all. The middle one is the teaching of 2.47, the Gita’s best known verse. Read in its own chapter, 11.32 belongs with that teaching. Arjuna is asked to act, and the outcome rests elsewhere.

Whether that lightened the weight for Oppenheimer, or only named it, is a question his life kept open. The verse, read slowly, asks something of every reader who has had to act inside events far larger than one person.

Questions people ask

What does “Now I am become Death, the destroyer of worlds” mean?
It is Oppenheimer’s English for Bhagavad Gita 11.32. Krishna, showing Arjuna his cosmic form, says “I am Time, grown vast, the maker of the worlds’ end,” and tells him the warriors facing him will fall whether or not he fights. In the Gita the words describe God as the time that ends all things.
Which Bhagavad Gita verse did Oppenheimer quote?
Chapter 11, verse 32. Accounts of the Trinity test also mention 11.12, the verse that compares the radiance of the cosmic form to a thousand suns rising at once.
Did Oppenheimer say it at the Trinity test?
The famous version is his recollection on NBC in 1965, twenty years after the test. A “shatterer of worlds” version was in print by the late 1940s, and the reporter William Laurence later wrote that he heard the line from Oppenheimer a few hours after the test. Whether it came to him in the moment itself cannot be confirmed.
What does kālo ’smi mean?
“I am Time.” Kāla comes from a root meaning to count or reckon. It means time, and time as what ends all things, so it can also mean death. Most translators choose Time; Oppenheimer’s teacher Arthur Ryder chose Death.
Is it Vishnu or Krishna speaking?
Krishna speaks the verse. Oppenheimer said Vishnu, and Arjuna himself addresses the cosmic form as Vishnu in 11.24 and 11.30. In Hindu tradition Krishna is an avatar of Vishnu.
What is Bhagavad Gita 11.32 in Sanskrit?
kālo ’smi lokakṣayakṛt pravṛddho lokān samāhartum iha pravṛttaḥ, ṛte ’pi tvāṃ na bhaviṣyanti sarve ye ’vasthitāḥ pratyanīkeṣu yodhāḥ. The verse page on this site has the Devanagari, a word-by-word gloss and our translation.

Tell us what is on your mind and read seven verses chosen for it, one a day, with the Sanskrit and its meaning.

Start my seven days

Sources

  1. James A. Hijiya, “The Gita of J. Robert Oppenheimer”, Proceedings of the American Philosophical Society 144.2 (2000). The NBC documentary, the 1948 and 1958 versions, Ryder and the 1933 letters, the translation of kāla.
  2. Transcript of the 1965 recollection, atomicarchive.com. Full wording of the filmed passage.
  3. Atomic Heritage Foundation, Trinity Test eyewitnesses. The same recollection, dated 1965.
  4. Arthur W. Ryder, The Bhagavad-Gita (University of Chicago Press, 1929). Public domain in the US since 2025.
  5. Edwin Arnold, The Song Celestial (1885), Project Gutenberg
  6. K. T. Telang, The Bhagavadgītā, Sacred Books of the East 8 (1882)
  7. Annie Besant and Bhagavan Das, The Bhagavad Gita (1905). Besant’s verse translation, first issued in the 1890s.
  8. Sanskrit commentaries of Shankara, Ramanuja, Shridhara, Madhusudana Sarasvati, Vallabha and Purushottama on 11.32 and 11.33, IIT Kanpur. Our English from the Sanskrit.
  9. Monier-Williams, Sanskrit-English Dictionary (1899), kāla
  10. Wikipedia, J. Robert Oppenheimer. Sanskrit with Ryder in 1933; a 1949 profile with the “shatterer” wording.

Sanskrit is from this site’s verse files, checked against the IIT Kanpur text. IAST is generated from the Devanagari. English renderings of the commentaries are our own. Translations shown are in the public domain or our own; modern translations are named, not quoted.