起信論疏筆削記 4.30

4.30

三、釋海字。疑意、釋意，如疏可知。法準思之者，應云：真如隨緣成於染淨，染淨雖成，真如不變。無變之性不礙染淨，染淨萬差，不礙一性，是故性相無二也。由是海之一字，以喻真如隨緣不變。

Third, explaining the word "ocean" (海). The point of doubt and the intended explanation can be known from the Commentary. Regarding "inferring and contemplating the dharma accordingly", one should say: Tathatā accords with conditions to produce defilement and purity; though defilement and purity are produced, tathatā remains unchanging. The unchanging nature does not obstruct defilement and purity; the myriad distinctions of defilement and purity do not obstruct the single nature. Therefore, nature and characteristics are non-dual. For this reason, the single word "ocean" is used to metaphorically illustrate that tathatā accords with conditions while remaining unchanging.