Sankhya Karika Verse 19
Sanskrit Verse
तस्माच्च विपर्यासात् सिद्धं साक्षित्वमस्य पुरुषस्य । कैवल्यं माध्यस्थ्यं द्रष्टृत्वमकर्तृभावश्च ॥ १९ ॥
Transliteration
tasmāt-ca viparyāsāt siddhaṃ sākṣitvam-asya puruṣasya | kaivalyaṃ mādhyastyaṃ draṣṭṛtvam-akartṛbhāvaḥ ca ||
Translation
And from that contrast it is proved that this Purusa is witness, solitary, indifferent, spectator, and non-, agent.
Reference: Sankhya Karika

Muni's Play