十不二門指要鈔 2.59

2.59

二、濁水下，諭。濁水諭迷中染心，清水諭果後淨心，波諭三千俱用，濕諭三千俱體。須知染中其水雖濁，亦全濕為波，清時豈別有波濕？故云無殊，則波之與濕皆無殊也。他謂波中之濕無殊者，濕性既不變，波性豈變邪？

Second, from "turbid water..." down, the metaphor. Turbid water illustrates the defiled mind in delusion; clear water illustrates the pure mind after fruition; waves illustrate the three thousand [realms] as entire function; wetness illustrates the three thousand [realms] as entire substance. One must know that in defilement, although the water is turbid, it is also completely wetness acting as waves; when clear, could there be separate waves and wetness? Therefore it says 'there is no difference,' meaning that both the waves and the wetness have no difference. Those others who claim that only the wetness within the waves has no difference—if the wet nature does not change, how could the wave nature change?