大乘起信論裂網疏 5.11

5.11

彼執我同虛空是常是有，今先明所同之空非常非有，則能同之我亦必非常非有也。有見者，以心分別說名虛空，是所緣相，故非常也。有對者，待於諸色，於無色處名之為空，是對待法，故非有也。又色尚唯是妄心分別，無有實體；虛空無色，又豈有實體哉？空既無體，則所計同空之我亦無體矣。

They cling to the self being identical to empty space, as eternal and existent; here, it is first clarified that the empty space to which it is likened is neither eternal nor existent, and therefore the self that is likened to it must also be neither eternal nor existent. 'Visible' means that it is discriminated by the mind and called empty space, being an objective characteristic, and hence not eternal. 'Has resistance' means that it is relative to physical forms, being called space where there is no physical form; because it is a relative phenomenon, it is not existent. Furthermore, physical form is still merely a discrimination of the deluded mind and has no real substance; how could empty space, which lacks physical form, have a real substance? Since space has no substance, the self calculated to be identical to space also has no substance.