淨名經集解關中疏 2.251

2.251

善宿菩薩曰。是動是念為二。不動則無念。無念則無分別。通達此者。是為入不二法門　肇曰。情發為動想成為念。又解。安住實性即性無動。無動即無念。

The Bodhisattva Sunakṣatra said, "This movement and this thought constitute duality. If there is no movement, there is no thought; if there is no thought, there is no discrimination. One who thoroughly penetrates this enters the dharma gate of non-duality."
Sengzhao says, "The stirring of emotion is movement; the forming of conceptualization is thought." Another explanation says, "Peacefully abiding in the true nature means that nature has no movement; no movement means no thought."