यद्वदन्ति ।यदिच्छन्तो ब्रह्मचर्यं चरन्ति तत्ते पदं संग्रहेण ब्रवीमि ।ओमित्येतत् ।एतद्ध्येवाक्षरं ब्रह्म एतद्ध्येवाक्षरं परम् ।एतद्ध्येवाक्षरं ज्ञात्वा यो यदिच्छति तस्य तत्' इति काठके ।'एतद्वै सत्यकाम परं चापरं च ब्रह्म यदोंकारः' इत्युपक्रम्य 'यः पुनरेतं त्रिमात्रेणोमित्येतेनैवाक्षरेण परं पुरुषमभिध्यायीत' इति प्रश्नोपनिषदि ।'ओमिति ब्रह्म ।ओमितीदं सर्वम्' इति यजुर्वेदारण्यके ।'तद्यथा शङ्कुना सर्वाणि पर्णानि संतृण्णान्येवमोंकारेण सर्वा वाक् संतृण्णा ।ओंकार एवेदं सर्वम् ।' इति छान्दोग्ये ।'ओमित्येतदक्षरम्' इत्युपक्रम्य
In plain words
That supreme abode which all the Vedas declare, desiring which seekers practice disciplined studentship—that I shall briefly declare to you: it is the syllable Om. This imperishable sound is Brahman indeed; this is the supreme reality. Knowing this imperishable one, whatever a person desires, that very thing becomes his—so records the Kaṭha Upaniṣad. 'O Satyakāma, this Omkara is indeed both the higher and the lower Brahman'—starting from this, the Praśna Upaniṣad adds: 'Whoever meditates upon the supreme Puruṣa through this very three-moraed syllable Om...' 'Om is Brahman. Om is this entire universe'—thus declares the Yajurveda Aranyaka. 'Just as all leaves are held together by the central pin of a leaf, so all speech is pierced and held together by Om. Om is indeed this entire universe'—thus states the Chāndogya Upaniṣad. Beginning with 'Om is this imperishable syllable'...
Close to the Sanskrit
Which they speak, desiring which they practice celibate student life, that abode in summary I declare to you: Om-this. This indeed is the imperishable Brahman, this indeed is the imperishable supreme. This indeed is the imperishable, having known which, who desires anything, of him that [is obtained], thus in the Kaṭha. 'This indeed, O Satyakāma, is the higher and lower Brahman, which is Oṃkāra'—thus commencing, 'Who again meditates upon this supreme person with the three-moraed Om-this very syllable'—thus in the Praśna Upaniṣad. 'Om is Brahman. Om is this all'—thus in the Yajurveda Aranyaka. 'That just as all leaves are pierced by a pin, thus all speech is pierced by Oṃkāra. Oṃkāra indeed is this all'—thus in the Chāndogya. 'Om this imperishable'—thus commencing...