楞伽阿跋多羅寶經註解 1.695

1.695

自覺聖智本不當空，而能空彼見過習氣，所既空已，能空亦空，即畢竟空也。

The noble knowledge of personal realization originally should not be empty, yet it can empty those habit-energies of the errors of views. Once the object is emptied, that which can empty is also empty; this is ultimate emptiness.