Sankaracarya's Vivekachudamani 494

निरुपममनादितत्त्वं त्वमहमिदमद इति कल्पनादूरम् ।

नित्यानन्दैकरसं सत्यं ब्रह्माद्वितीयमेवाहम् ॥

nirupamamanāditattvaṃ tvamahamidamada iti kalpanādūram |

nityānandaikarasaṃ satyaṃ brahmādvitīyamevāham ||

(Sankaracarya's Vivekachudamani 494)

I am unparalleled, the beginningless Reality, beyond all imagined distinctions such as 'you‘ and 'I‘,'this‘ and 'that.‘ The essence of Bliss eternal, the Truth, non-dual Brahman am I.