金剛經纂要刊定記 5.293

5.293

無著下。標。真如無二者。以虛實是空有斷常二邊，既言俱無，即顯中道也。

"Asaṅga..." and so forth sets this out. "Tathatā is non-dual": because unreal and real are the two extremes of emptiness and existence, or annihilation and permanence; since it says both are absent, it reveals the Middle Way.