Karika 37

सर्वं प्रत्युपभोगं यस्मात्पुरुषस्य साधयति बुद्धिः। सैव च विशिनष्टि पुनः प्रधानपुरुषान्तरं सूक्ष्मम् ॥३७॥

It is the intellect that accomplishes all the experiences for the sake of the purusha. Thus, only it can differentiate the difference between the material universe and the purusha, which is subtle.