瑜伽論記 23.244

23.244

下反舉六處生滅，有四行相，顯前無為四行相，以彼六處有生名有，有滅名無，待他有異，待自種類前後無別故名不異。

Below, it conversely adduces the arising and ceasing of the six sense-bases, which have four aspects, in order to reveal the four aspects of the unconditioned [state] mentioned before. Because those six sense-bases have arising, they are called 'existent'; because they have ceasing, they are called 'non-existent'; depending on others, there is 'difference'; and depending on their own class, being without differentiation before and after, they are called 'non-different'.