大乘起信論裂網疏 3.16

3.16

境界唯是自心、心所相分，故名虛妄，所謂依他起性，如幻事也。以此為所緣緣及增上緣，復生六相，能生既是虛妄，則所生相豈有實哉？然前三相通於八識及諸心所，以心、心所定各有四分故。此下六相則有局有通也。

Objects are merely the image components of one's own mind and mental factors, hence they are called "unreal"—namely, their nature of other-dependence is like an illusion. Taking these as the objective condition and the dominant condition, the six marks are further generated. Since that which generates is already unreal, how could the marks that are generated be real? However, the preceding three marks apply broadly to the eight consciousnesses and all mental factors, because mind and mental factors invariably each possess the four components. These subsequent six marks, on the other hand, have some that are restricted and some that are broad.