Vaisesika Sūtra 3.2.03

प्रयत्नायौगपद्याज्ज्ञानायौगपद्याच्चैकम् ॥३॥

prayatna-ayaugapadyāt-jñāna-ayaugapadyāt-ca-ekam ॥3॥

[प्रयत्न (prayatna) - effort; अयौगपद्यात् (ayaugapadyāt) - due to non-simultaneity; ज्ञान (jñāna) - knowledge; अयौगपद्यात् (ayaugapadyāt) - due to non-simultaneity; च (ca) - and; एकम् (ekam) - one (principle);]

Due to non-simultaneity of effort and the non-simultaneity of knowledge, it is inferred to be the same entity.