仁王經疏 3.42

3.42

問：何等名長壽天？答：依《智度論》三十二，長壽天者，非想非無想，壽八萬大劫。或有人云：一切無色定，通名長壽天，以無形不可化故；不堪得道，常是凡夫處故。或從初禪至四禪，除淨居天，皆名長壽天，以著味邪見不能受道，乃至彼間著味，善心難生故。又彼下文云「無色界中無形，不得說法故不在中生。色界中雖有色身可為說法，而深著禪味，不能大利益眾生故，是故不在中生。」有云：北欝單越以為一數，除其邊地（勘）。

Question: What are called the "long-lived devas"? Answer: Relying on the thirty-second fascicle of the Prajñāpāramitopadeśa, the long-lived devas are those of neither-conceptualization-nor-non-conceptualization, with a lifespan of eighty thousand great kalpas. Alternatively, some say: all formless concentrations are generally called "long-lived devas" because they lack form and cannot be converted; they are incapable of attaining the path, and are always the abode of ordinary beings. Alternatively, from the first dhyāna to the fourth dhyāna, excluding the Śuddhāvāsa heavens, all are called "long-lived devas" because their attachment to relish and deviant views prevents them from receiving the path, up to the point that while attached to relish there, a wholesome mind is difficult to arise. Furthermore, a lower passage in that text says: "In the formless realm there is no form, and because the Dharma cannot be preached, [bodhisattvas] are not born therein. Although in the form realm there is a material body to which the Dharma can be preached, yet because they are deeply attached to the relish of dhyāna, they cannot greatly benefit sentient beings; therefore, [bodhisattvas] are not born therein." Some say: Uttarakuru is taken as one count, excluding the border region (to be verified).