Yoga Sūtra Chapter Four verse 18

सदाज्ञाताः चित्तव्र्त्तयः तत्प्रभोः पुरुषस्यापरिणामित्वात् ॥१८॥

sadā jñātāḥ citta-vṛttayaḥ tat-prabhoḥ puruṣasya-apariṇāmitvāt ||18||

The fluctuations of the psyche always known
due to the non-transformation of the master,
that animating principle.

sadā - alwaysjñāta - knowncitta - psyche; heart as the seat of feelings and sensationsvṛtti - fluctuation; turned; set in motion; professiontat - thatprabhu - master, mighty, powerfulpuruṣa - animating principle, self, consciousness, spiritapariṇāmitvā - non-transformative