The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 335

चित्तं वाव संकल्पाद्यूयो यदा वै चेत-यतेऽथ संकल्पयतेऽथ मनस्यत्यथ वाच-मीरयति तामु नाम्नीरयति नाम्नि मन्त्राएकं भवन्ति मन्त्रेषु कर्माणि ॥ १ ॥

In plain words

Mind is truly greater than resolve. For when a person cognizes, then he forms a resolve, then he conceptualizes, and then he speaks. He gives expression to that speech through a name; within names the mantras become unified, and within mantras, ritual actions.

Close to the Sanskrit

Mind indeed is greater than resolve. When indeed one perceives, then he resolves, then he conceptualizes in mind, then he utters speech. He expresses that very speech in a name; in name mantras become one, and in mantras actions.