Vaisesika Sūtra 6.1.11

समे हीने वा प्रवृत्तिः ॥११॥

samē hīnē vā pravṛttiḥ ॥11॥

[समे (samē) - in the equal; हीने-वा (hīnē-vā) - or in the inferior; प्रवृत्तिः (pravṛttiḥ) - tendencies;]

Equal or inferior is determined by tendencies.