Patanjali Yoga Sutra 2.23

Sanskrit Sutra

स्वस्वामिशक्त्योः स्वरूपोपलब्धिहेतुः संयोगः॥२३॥

Swami Vivekananda's translation

Junction is the cause of the realisation of the nature of both the powers, the experienced and its Lord.

Chapter link: Yoga Sutra Chapter 2