仁王經疏 3.325

3.325

釋曰：第四、辨觀行相。言一切者，真如一味相，即是一相名為無相。是以《無量義經》云「一相即無相」也。而無二者，結上一相及無相，皆無有無等二相也。

Explanation: Fourth, distinguishing the active characteristics of contemplation. 'All' refers to the single-flavor mark of tathatā, which is the single mark named the signless. Therefore the *Sūtra of Immeasurable Meanings* says: 'The single mark is the signless.' 'And are nondual' concludes that the preceding single mark and signless both lack the dual marks of existence, nonexistence, and so on.