俱舍論記 8.108

8.108

「由離能住至所說如是」者，答。凡言識住，由離能住識，別立所住四蘊。非能住識可名識住，故不可說識為識住，如非即王可名王座。或若有四蘊法，識所乘御，說名識住。喻況如人乘船道理，非識御識，故識非識住。

Regarding "Because apart from that which is able to abide [...] as it has been stated": this answers. Whenever "station of consciousness" is spoken of, apart from the consciousness that is able to abide, the four skandhas that are abided in are separately established. The consciousness that is able to abide cannot be called a station of consciousness; hence, consciousness cannot be said to be a station of consciousness, just as a king himself cannot be called the king's throne. Or, if there are dharmas of the four skandhas that are ridden and controlled by consciousness, they are said to be stations of consciousness. The analogy is like the principle of a person riding in a boat: consciousness does not ride and control consciousness, so consciousness is not a station of consciousness.