大乘起信論義記 2.142

2.142

初中言生二種者，此二既在隨動門中，故云生也。生已不離不動覺體，故云與彼不相離也。

In the first part, 'produces two kinds' means: since these two are in the gate of according with movement, it says 'produces.' Having been produced, they are not separate from the unmoving essence of enlightenment; hence it says 'not separated from that.'