瑜伽論記 5.48

5.48

解云：處處經論皆言眾生界不增不減，以眾生無始舊有非新有故，無增而有無量，定性二乘入無餘時墮非生數，理亦有減，以從多故說言無減，如海一滴。

It is explained: In various sūtras and treatises, it is always said that the realm of sentient beings neither increases nor decreases, because sentient beings have existed from beginningless time and are not newly existent; thus there is no increase, yet they are limitless. When [practitioners of] the two vehicles of fixed gotra enter [nirvāṇa] without remainder, they fall outside the category of living beings, so in principle there is also decrease; but following the majority, it is said that there is no decrease, just like a single drop in the ocean.