俱舍論疏 20.99

20.99

論「理必應然至無上是無上」，經部重引經印成也。經既言，便知有是有，非有是非有。故知非有亦是識境。已上通二經竟。已下破二理也。

The Śāstra says: "In principle it must indeed be so... the unexcelled is the unexcelled": the Sautrāntikas again cite a sūtra to confirm it. Since the sūtra says: 'One then knows that the existent is existent, and the non-existent is non-existent', hence we know that the non-existent is also an object of consciousness. The above finishes resolving the two sūtras. Below refutes the two rational arguments.