首楞嚴義疏注經 2.142

2.142

Because it cannot be seen, it is not form; because it exists when conditions assemble, it is not emptiness. As for the term 'primal nature' (míngdì), it is also called 'dark nature' (míngxìng) or 'self-nature' (prakṛti). In Sanskrit it is Sāṃkhya-śāstra, translated here as the Enumerators (Sāṃkhya), who posit twenty-five principles (tattvas). The very first principle is named the primal nature (prakṛti), which they conceive of as permanent. The twenty-fifth is named the spirit-self (puruṣa), which they also conceive of as permanent. When the self contemplates supreme objects, the primal nature transforms into the twenty-three principles for the self's enjoyment. Once the self enjoys them, it is bound by objects and cannot attain liberation; if the self does not contemplate them, the primal nature does not transform, and since there is no bondage, the self is liberated, which is called nirvāṇa, as explained elsewhere. Gośālīka is not actually a Sāṃkhya, but belongs to that category; he is merely mentioned in passing.