Vaiśeṣika Sūtra 3.2.8

3.2.8

tasmād āgamikam |

tasmāt—therefore, because the Soul cannot be proved by reasoning; āgamikaḥ—scriptural, proved by the revealed texts.

8. Therefore (the Soul is) proved by Revelation.

The Soul is really proved by Revelation only, but not by inference, since visible and commonly-observed marks do not exist. Therefore, mental vision of the principles or essences of things results from the proper hearing of the Upaniṣads, and not from the course of intellection. So that this Regulation (i.e., the Vaiśeṣika system), which teaches intellection, is no regulation. For, it is observed in the case of “ten ghosts, swimming across the river,” etc., that the cognition of the person who has representation of these things in his consciousness, arises only from the very instructions that ten ghosts dwell on this tree, that such and such an object floats across the river, etc.).—8,