四明十義書 1.87

1.87

祇如於識陰修圓三觀者，約何義說假觀耶？豈說緣生假耶？豈說建立之假耶？既修此等之假，仍須即陰說具三千方為妙假。故荊溪云：具即是假。又《妙經疏》以十二入為境，各具千如為觀。若非此假，則空中亦淺，全非圓觀也。

Just as in cultivating the perfect threefold contemplation upon the aggregate of consciousness, in terms of what meaning is the contemplation of the conventional spoken of? Is it spoken of as the conventional of conditioned arising? Is it spoken of as the conventional of establishment? Since one cultivates these forms of the conventional, one must still speak of possessing the three thousand as identical with the aggregate to constitute the wondrous conventional. Therefore Jingxi says: 'Possession is itself the conventional.' Furthermore, the Miaojing shu takes the twelve sense-entrances as the object, with each possessing the thousand suchnesses as the contemplation. If not for this conventional, then emptiness and the middle would also be shallow, and it would not be the perfect contemplation at all.