俱舍論記 13.109

13.109

「非但由此至非不應理」者，論主破。非但由此三時起思業道究竟，勿自母等實未被害，於闇室中由謂已害，起三時思成無間業。然於自造不誤殺事，起三時思殺罪便觸。若依此說，非不應理。實未被殺，但起三思，即不應理。

"Not solely through this ... is not unreasonable" is the author's refutation. It is not solely through giving rise to volition at these three times that the path of karma is completed; lest someone's own mother or the like was not actually killed, but in a dark room, believing that they had already killed her, gave rise to volition at the three times and thereby completed an immediate karma. However, when performing an act of killing oneself without error, giving rise to volition at the three times does indeed incur the sin of killing. If explained according to this, it is not unreasonable. If the being was not actually killed, and one merely gave rise to the three volitions, that would indeed be unreasonable.