Vaisesika Sūtra 9.2.12

अदुष्टं विध्या ॥१२॥

aduṣṭaṁ vidhyā ॥12॥

[अदुष्टम् (aduṣṭam) - faultless; विध्या (vidhyā) - correct knowledge;]

Faultless knowledge is valid.