瑜伽論記 14.108

14.108

又準顯揚論，虛空亦通遍計等三性，三藏亦云：八種無為皆通三性。基云：虛空無為者，思所緣境相相似故立為常，非緣彼心，緣彼境界有時變易故。

Furthermore, based on the Prakaraṇāryavācā, space also extends across the three natures, such as the parikalpita. The Tripiṭaka Master also said: The eight kinds of unconditioned dharmas all extend across the three natures. Ji says: Space as an unconditioned dharma is established as eternal because the marks of the object of cognizing contemplation are similar, not because of the mind cognizing it, for the cognitive object thereof undergoes change at times.