俱舍論疏 14.108

14.108

論「毘婆沙者至不許斯義」，有部以無教故不許。《正理》破云「復減於此，何理相違，謂所化根有難調者，已許為說晝夜律儀，何不為調漸難調者說唯一夜一晝須臾，以難調根有多品故。」由此知有近住定時，若減若增便不發戒，世尊觀見故唯說此。是故經部與正理師無諍理中橫興諍論。

The treatise says: "The Vaibhāṣikas ... do not accept this doctrine." The Sarvāstivādin does not accept it due to the absence of scripture. The Nyāyānusāra refutes: "If reducing further from this, what principle would be contradicted? If you say that among the faculties of those to be transformed there are those difficult to tame, and it is already permitted to teach them the day-and-night restraint, why not, for the sake of taming those who are progressively more difficult to tame, speak of only a single night, a single day, or an instant (muhūrta), since faculties difficult to tame have many grades?" From this we know that there is a fixed duration for upavāsa; if decreased or increased, it simply does not produce the precepts, and the World-Honoured One, having perceived this, spoke only of this. Therefore, between the Sautrāntikas and the masters of the Nyāyānusāra, disputes are improperly stirred up where there is no contentious principle.