The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 361

यदा वै श्रद्दधात्यथ मनुते नाश्रद्दध-न्मनुते श्रद्दधदेव मनुते श्रद्धा त्वेव वि-जिज्ञासितव्येति श्रद्धां भगवो विजिज्ञा-स इति ॥ १ ॥

In plain words

When a person has faith, only then do they reflect on the truth; without faith, reflection does not arise. Therefore, it is faith itself that we must seek to understand. 'Master, I wish to understand faith.'

Close to the Sanskrit

When indeed one has faith, then one reflects; one who does not have faith does not reflect; only one who has faith reflects. 'Faith, indeed, must be desired to be known.' 'O venerable one, I desire to know faith.'