首楞嚴義疏注經 9.2

9.2

二、色界者，以此界中依、正二報色法殊勝，從勝為名也。通名梵世者，梵是淨義，離欲染故，禪所生故，異散動故。此界總有一十八天，若《俱舍》云「三靜慮各三，第四靜慮八」，即除無想也。依大眾部，與今經同，即加無想。

Second, the form realm (rūpadhātu): it is named after what is superior because within this realm the material forms of both circumstantial and direct retributions are exquisite. It is collectively called the Brahmā worlds because *brahmā* means pure—being free from defilement of desire, produced by dhyāna, and distinct from distraction and disturbance. This realm contains eighteen heavens in all. According to the *Kośa*, which states: "The [first] three dhyānas have three each, and the fourth dhyāna has eight," the Heaven of Non-conception (Asaṃjñisattva) is excluded. Relying on the Mahāsāṃghika school, in agreement with the present sūtra, the Heaven of Non-conception is added.