請觀音經疏闡義鈔 3.57

3.57

經「五繫縛」者。謂頭及手足五處被繫。若作所表，是五分障也。「海是」下，釋入於大海也。初約生死深廣如海、二約法性深廣如海。「妄想動法性」者，妄想如黑風也。動法性者，即是全法性為無明，無染而染遍造生死，名為波浪也。

The sūtra's "five bindings" means being bound in the five places: the head, hands, and feet. If taken as what is represented, they are the five components of obstacles. From "The ocean is" onward explains entering the great ocean. First, it is treated in terms of birth and death being deep and vast like an ocean; second, it is treated in terms of dharmatā being deep and vast like an ocean. "Deluded thoughts agitating dharmatā": deluded thoughts are like the black wind. Agitating dharmatā means that the entirety of dharmatā becomes ignorance, and being defiled without defilement, it universally produces birth and death; this is called the waves.