Ch. 16 Yoga of Distinction Between āsurī and daivī qualities (Part 5)
Therefore, it does not mean that belief in śāstra means that the buddhi is going to stop working. In the sixth chapter, Bhagavān himself has explained how important the buddhi is.
buddhi-grāhyam atīndriyam ॥
The nature of the ātmā is beyond the senses and the manas. The Upaniṣat says —
yanmanasā na manute yenāhur-mano matam ॥
Kenopaniṣat