瑜伽論記 2.258

2.258

第七作受解脫難中，設是我者，我應無常者，彼受者、作者等，不是諸行，即是我者，我應無常，有作用故，如手足等，若無變異，應非受者等，無變異故，如虛空等。

Under the seventh, the objection concerning the agent, experiencer, and liberation: 'If it were the self, the self would be impermanent.' If that experiencer, agent, and so forth are not the conditioned formations, but rather are the self, the self would have to be impermanent, because it possesses functional activity, like the hands and feet. If it undergoes no change, it should not be the experiencer and so forth, because it is unchanging, like empty space.