इतीशावास्ये ।'सर्वेषां भूतानामान्तरः पुरुषः सम आत्मेतिविद्यात्' 'आत्मा वा इदमेक एवाग्र आसीन्नान्यत्किं-चन' 'एकं सद्विप्रा बहुधा वदन्ति' 'एक सन्तं बहुधाकल्पयन्ति' 'एको विममे त्रिभिरित्पदेभिः' 'एको दाधारभुवनानि विश्वा' 'एक एवाग्निर्बहुधा समिद्धः' इति ऋ-ग्वेदे ।'सदेव सोम्येदमग्र आसीदेकमेवाद्वितीयम्' इतिच्छान्दोग्ये ।
In plain words
Thus in the Isha Upanishad: 'One should know the indwelling spirit of all beings to be the same self.' And: 'The self alone was this in the beginning, and nothing else whatsoever.' And in the Rigveda: 'Sages speak of the one reality in many ways... Fire, though one, is kindled in manifold forms.' And in the Chandogya: 'In the beginning, dear boy, this was existence alone—one only, without a second.'
Close to the Sanskrit
Thus in the Isha. 'One should know the inner person of all beings as the equal self' 'The self indeed was this one alone in the beginning, nothing else whatsoever' 'Reality is one, sages speak of it in many ways' 'They imagine the one existent in many ways' 'One measured out with three steps' 'One supported all the worlds' 'Fire, being one alone, is kindled in many ways' thus in the Rigveda. 'Being alone was this in the beginning, O dear one, one only without a second' thus in the Chandogya.