This is kaivalya, the indivisible state of existence.

Verse 3.56

सत्त्वपुरुषयोः शुद्धिसाम्ये कैवल्यम् 

sattva-puruṣayoḥ śuddhisāmye kaivalyam ॥56॥

By the similarity of purity between the Sattva and the Purusa comes Kaivalya.

When the vestures of the soul are equal in purity to that of the soul, there is harmony between them. There comes freedom, kaivalya, of the seer, uncontaminated by the qualities of nature.

By yogic discipline, the veil of ignorance is lifted from the intelligence. This is the real and true light: vivekaja jnanam, illuminative consciousness. It becomes equal to that of the light of the soul, purusha. 

The distinction between

intelligence and consciousness comes to an end. Both dissolve in the beacon light of the soul. They are isolated from contact with nature's objects. The seeds of affliction are burnt up. 

Now the Soul shines in its pristine form, in its pure effulgence: it reigns supreme. This is kaivalya, the indivisible state of existence.

PATANJALI YOGA SUTRAS