四明十義書 1.77

1.77

又所觀心境如何名真？若令始行緣於真心修觀，正當荊溪所揀，緣理斷九，義歸別教也。

Moreover, how could the mind-object that is contemplated be called true? If you make a beginner take the true mind as an object to cultivate contemplation, that falls right under what Jingxi rejected as "taking principle as an object to eliminate the nine [realms]," whose meaning belongs to the Separate Teaching.