瑜伽師地論略纂 2.80

2.80

Regarding "the Trāyastriṃśa devas increase by one foot (pāda)": "foot" means a fraction. One krośa is divided into four parts; within one part it is further divided into four parts, and it increases by this one part, hence it says "one foot". Where it says below "increases by one foot", its meaning is also the same. This shows that the devas of Tuṣita have half a krośa plus one fraction; the devas of Nirmāṇarati have [half a krośa] plus two fractions; the devas of Paranirmitavaśavartin have bodies with [half a krośa] plus three fractions. Alternatively, someone explains: "one foot" means that a krośa is divided into four parts, and within one part it is further divided into two; it adds one fraction of these two, hence it says "one foot". That is, it shows that the bodily size of the devas of Tuṣita is half a krośa plus half a fraction; the bodily size of the devas of Nirmāṇarati is three fractions of a krośa; the bodily size of the devas of Paranirmitavaśavartin is three fractions and a half, which is one krośa minus [half a fraction]. The Kośa differs, stating: "For the desire-realm devas, each increases by one-fourth of a krośa, up to Paranirmitavaśavartin, which is one and a half krośas." The rest are all the same as this. Question: If based on the Kośa, the lifespan of the Brahmā king is one and a half [kalpas], and his stature is one and a half yojanas. Since the Mahāyāna takes sixty kalpas as one kalpa, why is the Brahmā king's stature not said to be one yojana and a half as one [measure]? Answer: A kalpa is a name for time, posited according to phenomena; a yojana is a measure of spatial extent, and cannot be spoken of arbitrarily.