大般涅槃經義記 6.36

6.36

Fourth, "Such an emptiness of emptiness is also not the same..." and below relies on contrast to reveal the difference: the treatises speak differently of what is attained by śrāvakas. In the teachings of the Abhidharma, it is said that śrāvakas first observe that the five aggregates are not self or what belongs to self, which is simply called emptiness; afterwards they observe that the preceding wisdom is also not self or what belongs to self, which is called the emptiness of emptiness. In the teachings of the *Tattvasiddhi*, they first observe that beings and dharmas are empty and lack self-nature, which is simply called emptiness; afterwards they observe that the preceding wisdom is also empty and lacks self-nature, which is called the emptiness of emptiness. What is discussed here is free from the marks of existence and non-existence, and is therefore said to be not the same.