俱舍論疏 15.167

15.167

論「定復有三至總成四種」，開二為四。此中所明不定者，非三時定受，總名不定。

On the Śāstra's statement: "Determinate again has three [...] altogether making four kinds": It expands the two into four. What is explained here as indeterminate is not determinately experienced in the three times; it is collectively termed indeterminate.