इत्युपनिषदामुक्तिस्तथा श्रुतिर्भगवदुक्तिश्च ।ज्ञानी त्वात्मैवेयं मतिर्ममेत्यत्र युक्तिरपि ॥ १२१ ॥
In plain words
This is what the Upaniṣads say. Śruti says it. The Lord himself says it: "the one who knows is the Self and nothing else — that is my settled conviction." And on this point, reasoning says it too.
Close to the Sanskrit
Such is the utterance of the Upaniṣads, and likewise śruti, and the word of the Lord: "the knower, indeed, is the Self alone — this is my conviction"; and here there is reasoning also.