Vaisesika Sūtra 3.2.11

द्रुष्ट आत्मनि लिङ्गे एक एव द्रुढत्वात् प्रत्यक्षवत् प्रत्ययः ॥११॥

dṛṣṭa ātmani liṅge eka eva dṛḍhatvāt pratyakṣavat pratyayaḥ ॥11॥

[द्रुष्ट (dṛṣṭa) - seen / preceived; आत्मनि (ātmani) - in the ātman; लिङ्गे (liṅge) - in the indicator; एकः (ekaḥ) - one / definitive; एव (eva) - indeed; द्रुढत्वात् (dṛḍhatvāt) - due to firmness; प्रत्यक्षवत् (pratyakṣavat) - like direct perception; प्रत्ययः (pratyayaḥ) - cognition;]

Cognition based on direct perception is definitive in the Ātma, where the indicator is perceived due to firmness.