肇論新疏 3.60

3.60

尋夫經論之作（立），豈虛搆（造）哉？果有其所以不有，故不可得而有；有其所以不無，故不可得而無耳。

When we examine the composition of the sūtras and treatises, how could they have been constructed in vain? Indeed, there is that by which it is not existent, so it cannot be apprehended as existent; there is that by which it is not non-existent, so it cannot be apprehended as non-existent.