Patanjali Yoga Sutra 3.56
Sanskrit Sutra
सत्त्वपुरुषयोः शुद्धिसाम्ये कैवल्यमिति॥५६॥
Swami Vivekananda's translation
By the similarity of purity between the Sattva and the Purusha comes Kaivalya.
Chapter link: Yoga Sutra Chapter 3
Related Gunas: Sattva

Muni's Play