大般涅槃經義記 5.360

5.360

「空、無相、願」論說不同，依如《毘曇》，分十六行以為三門，空、無我行名為空門，滅下四行為無相門，餘名無願。若依《成實》，觀法性空名為空門，於此空中無相可取名無相門，於此空中無有貪求願行之心名無願門。

Regarding 'emptiness, signlessness, and wishlessness', the treatises explain them differently. According to the Abhidharma, the sixteen modes of practice are divided into three gates: the modes of emptiness and non-self are called the gate of emptiness; the four modes under cessation are the gate of signlessness; the remainder are called wishlessness. If according to the Tattvasiddhi, contemplating the emptiness of the nature of dharmas is called the gate of emptiness; within this emptiness there is no sign to be grasped, which is called the gate of signlessness; within this emptiness there is no mind of craving, seeking, wishing, or practicing, which is called the gate of wishlessness.