Mantra 1

प्रथमोऽध्यायः द्वितीयोऽध्यायः तृतीयोऽध्यायः चतुर्थोऽध्यायः पञ्चमोऽध्यायः षष्ठोऽध्यायः अथ पञ्चमोऽध्यायः ।प्रथमं ब्राह्मणम् ।(शांतिब्राह्मणम् ) पूर्णमदः पूर्णमिदं पूर्णात्पूर्णमुदच्यते ।पूर्णस्य पूर्णमादाय पूर्णमेवावशिष्यते ।खं ब्रह्म ।खं पुराणम् ।वायुरं खम् ।इति ह स्माह कौरव्यायणीपुत्रः ।वेदोऽयं ब्राह्मणा विदुः ।वेदैनेन यद्वेदितव्यम् ॥५,१.१ ॥

In plain words

That is full; this is full. From the full the full comes forth. Taking the full from the full, the full alone remains. "Space is Brahman; space is the ancient one; space is filled with wind." So said the son of Kauravyāyaṇī. This is the Veda, as brahmins know; by it one knows what is to be known.

The commentators

Bṛhadāraṇyakopaniṣadbhāṣyam· Leaf 9.347· bhāṣya

अथ अनन्तरं याज्ञवल्कीयस्य काण्डस्य वंश आरभ्यते, यथा मधुकाण्डस्य वंशः । व्याख्यानं तु पूर्ववत् । ब्रह्म स्वयंभु ब्रह्मणे नम ओमिति ॥

In plain words

Now the lineage for the Yājñavalkīya book begins, just as it did for the Madhu-kāṇḍa before it -- and it is explained the same way, so there is no need to repeat the method. Brahman, self-existent. Homage to Brahman. Om.

Close to the Sanskrit

Now next, the lineage of the Yājñavalkīya book is begun, just as the lineage of the Madhu-kāṇḍa [was given]. The explanation, however, [is] as before. Brahman, self-existent; homage to Brahman; Om -- thus.

Bṛhadāraṇyakopaniṣadbhāṣyam· Leaf 10.17

दिव प्रत्यवभासमानम्- तत्, यत् आत्मानमेव परं पूर्णं ब्रह्म विदित्वा- अहम् अदः पूर्णं ब्रह्मास्मि इत्येवम्, पूर्णमादाय, तिरस्कृत्य अपूर्णस्वरूपताम् अविद्याकृतां नामरूपोपाधिसंपर्कजाम् एतया ब्रह्मविद्यया पूर्णमेव केवलम् अवशिष्यते ; तथा चोक्तम् 'तस्मात्तत्सर्वमभवत्' इति । यः सर्वोपनिषदर्थो ब्रह्म, स एषः अनेन मन्त्रेण अनूद्यते, उत्तरसंबंधार्थम् । ब्रह्मविद्यासाधनत्वेन हि वक्ष्यमाणानि साधनानि ओंकारदमदानदयाख्यानि विधित्सितानि, खिलप्रकरणसंबंधात् सर्वोपासनाङ्गभूतानि च ॥

अत्रैके वर्णयन्ति-पूर्णात् कारणात् पूर्णं कार्यम् उद्रिच्यते ; उद्रिक्तं कार्यं वर्तमानकालेऽपि पूर्णमेव परमार्थवस्तुभूतं द्वैतरूपेण ; पुनः प्रलयकाले पूर्णस्य कार्यस्य पूर्णताम् आदाय आत्मनि धित्वा पूर्णमेव अवशिष्यते कारणरूपम् ; एवम् उत्पत्तिस्थितिप्रलयेषु त्रिष्वपि कालेषु कार्यकारणयोः पूर्णतैव ; सा च एकैव पूर्णता कार्यकारणयोर्भेदेन व्यपदिश्यते ; एवं च द्वैताद्वैतात्मकमेकं ब्रह्म । यथा किल समुद्रो जलतरङ्गफेनबुद्बुदाद्यात्मक एव, यथा च जलं सत्यं तदुद्भवाश्च तरङ्गफेनबुद्बुदादयः समुद्रात्मभूता एव आविर्भावतिरोभावधर्माणः परमार्थसत्या एव- एवं सर्वमिदं द्वैतं परमार्थसत्य- सर्वाणि पर्णानि' इत्यादिश्रुत्यन्तरात्; इतश्चायं वेदः ॐका- रः, यद्वेदितव्यम्, तत्सर्वं वेदितव्यम् ओंकारेणैव वेद एने- न; अतः अयमोंकारो वेदः; इतरस्यापि वेदस्य वेदत्वम् अत एव; तस्मात् विशिष्टोऽयमोंकारः साधनत्वेन प्रतिपत्तव्य इति । अथवा वेदः सः, कोऽसौ? यं ब्राह्मणा विदु. ओ- कारम्; ब्राह्मणानां हि असौ प्रणवोद्गीथादिविकल्पैर्विज्ञेयः; तस्मिन्हि प्रयुज्यमाने साधनत्वेन सर्वो वेदः प्रयुक्तो भवतीति ॥

In plain words

That radiant one shining in the sky -- that is what the word 'that' means. Once you know the Self itself as the one supreme, complete Brahman, you can say: I am that complete Brahman. Taking hold of that fullness this way strips away the false sense of incompleteness -- a sense ignorance produced, born only from contact with name and form. Through this knowledge of Brahman, fullness alone is left standing, nothing else. Scripture says the same thing elsewhere: therefore all this came to be full. What every Upaniṣad is really pointing to is Brahman, and this verse simply restates that, to connect what has been said with what comes next. The practices about to be taught -- meditation on Om, self-restraint, giving, compassion -- all serve knowledge of Brahman, belong to this part of the text, and support every form of meditative worship alike.

Here is another way some teachers put it: fullness rises out of a full cause. That effect, even now while it still stands as this visible world of two, is genuinely full -- fully real, only wearing the shape of duality. And when the world dissolves, that same fullness is simply taken back into its source, and fullness -- now in the shape of cause -- is all that is left. So through arising, standing, and dissolving alike, there is only ever fullness, whether you call it effect or cause; one single fullness wears two names. That is how Brahman can be one and still show both a dual and a non-dual face. Think of the ocean: it is nothing but water, wave, foam, and bubble together, and the water is real, and the waves and foam and bubbles that rise from it are themselves the ocean's own substance -- they only appear and vanish, but what they are made of is real through and through. In just that way, all this duality... … '...all the leaves' -- so say this and other scriptures. And this tells us something: the Veda is the syllable Om. Whatever there is to know, you know it entirely through Om alone. That is why Om is the Veda, and why the rest of the Veda even earns the name 'Veda' in the first place. So this Om stands apart, and is to be grasped as the means it is. Or take it another way: that 'Veda' the brahmins know -- what is it? It is Om. To the brahmins it is to be known through its various guises, as praṇava, as udgītha, and so on. Because once Om itself is put to use, the whole Veda is, in effect, already at work.

Close to the Sanskrit

[That is] the one shining forth in heaven -- that; in that, having known the Self alone as the supreme, full Brahman -- 'I am that full Brahman' -- thus, taking hold of fullness, having set aside the state of incomplete nature made by ignorance, born from contact with the limiting adjuncts of name and form, by this knowledge of Brahman fullness alone, exclusively, remains. And thus it is said: 'therefore all that came to be' -- thus. That which is the meaning of all the Upaniṣads, Brahman -- that very one is recapitulated by this mantra, for the sake of connection with what follows. Because, as a means to the knowledge of Brahman, the means about to be stated -- called Om, restraint, giving, and compassion -- are intended to be enjoined, and, because of their connection with the supplementary section, they are also limbs common to every form of meditative worship.

Here, some explain: from the full cause, the full effect rises up. The effect, thus arisen, even in its present state, is indeed full, a really-existent thing, in the form of duality. Again, at the time of dissolution, taking the fullness of the full effect and placing it in itself, fullness alone remains, in the form of the cause. Thus, in all three states -- origination, continuance, and dissolution -- there is fullness alone, of both effect and cause. And that one single fullness is designated differently as effect and cause, by mere difference. And thus Brahman is one, having the nature of both duality and non-duality. Just as, indeed, the ocean itself has the nature of water, wave, foam, bubble, and the rest; and just as the water is real, and the waves, foam, and bubbles arising from it, being themselves of the very substance of the ocean, having only the property of appearing and disappearing, are themselves really existent -- so all this duality [is] really exist[ent] -- … -- '...all the leaves' -- because of this and other different scriptural passages. And hence this Veda is the syllable Om: whatever is to be known, all of that one knows by this very Om, by this. Therefore this Om is the Veda; the Veda-ness of the rest of the Veda, too, is from this very source. Therefore this Om, being distinguished, is to be understood as a means -- thus. Or else: 'the Veda' -- who is that? [It is] Om, which the brahmins know. For, to the brahmins, that [Om] is to be understood through its various forms, as praṇava, udgītha, and so on. For when that is employed as a means, the whole Veda, in effect, becomes employed -- thus.