MUṆḌAKA UPANISHAD · 2.2.3

धनुर्गृहीत्वौपनिषदं महास्त्रं
शरं ह्युपासानिशितं संधयीत ।
आयम्य तद्भावगतेन चेतसा
लक्ष्यं तदेवाक्षरं सोम्य विद्धि ॥ ३॥

dhanurgṛhītvaupaniṣadaṃ mahāstraṃ
śaraṃ hyupāsāniśitaṃ saṃdhayīta ।
āyamya tadbhāvagatena cetasā
lakṣyaṃ tadevākṣaraṃ somya viddhi ॥ 3॥

Take up the bow of the Upanishad, that mighty weapon, set to it an arrow sharpened by adoration, draw the bow with a heart wholly devoted to the contemplation of That, and O fair son, penetrate into That as thy target, even into the Immutable.

Sri Aurobindo · CWSA 18, p. 139