स्थूलं सूक्ष्मं कारणं च तुर्यचेति चतुर्विधम् ।
भानाश्रयं हि तन्नाम भानस्याप्युपचर्यते ॥ २ ॥
The gross, subtle, causal and the Fourth are thus the four types
Inherent in vital awareness, indeed these named then attend on vital awareness.
Commentary
In this verse the sage outlines the four types of functions inherent in vital awareness. Vyasa in his commentary on the Yoga Sutra divides Prajna into a fourfold classification.