Vaisesika Sūtra 8.1.01

द्रव्येषु ज्ञानं व्याख्यातम् ॥१॥

dravyeṣu jñānaṃ vyākhyātam ॥1॥

[द्रव्येषु (dravyeṣu) - in substances; ज्ञानं (jñānam) - knowledge; व्याख्यातम् (vyākhyātam) - has been explained;]

Knowledge regarding substances has been explained.