धनुर्गृहीत्वौपनिषद महास्त्र शर ह्युपासानिशित सदधीत ।आयम्य तद्भावगतेन चेतसा लक्ष्य तदेवाक्षर सोम्य विद्धि ॥ ३ ॥
In plain words
Taking up the great bow of the Upaniṣads as your weapon, and placing upon it the arrow sharpened by constant meditation, draw the bowstring with a mind utterly absorbed in that reality. Know that very imperishable Brahman as your target, O gentle one.
Close to the Sanskrit
Having taken the bow, the great weapon of the Upaniṣads, set upon it the arrow sharpened by meditation; having drawn it with a mind absorbed in the state of that, know that very imperishable as the target, O gentle one.