成唯識論演祕 6.171

6.171

論：經部諸師許無色界諸心、心法是無色相、無體、無實所取境義，顯現所依。

Treatise: "The Sautrāntika masters accept that all minds and mental factors in the formless realm are the basis of manifestation for grasped objective referents that lack form-characteristics, lack substance, and lack reality."