請觀音經疏闡義鈔 3.15

3.15

「申三業之機」者，五體投地等是身業，繫念等是意業，當請彼佛是口業。「無創」等者，創與瘡同。《禮記》「頭有創則沐」，字皆此作。《大經》云「如人手瘡，捉持毒藥，毒則隨入。若無瘡者，毒則不入。瘡即菩提因緣，毒即第一妙藥。」

Regarding "expressing the capacity through the three karmas": throwing the five limbs to the ground and so forth is bodily karma; fixing mindfulness and so forth is mental karma; and invoking that Buddha is vocal karma. Regarding "without wounds" and so forth: chuang (wound) is identical to chuang (sore). The Book of Rites says, "If there is a wound on the head, one washes the hair"; the character is written this way in all such cases. The Mahāparinirvāṇa Sūtra says, "Just as when a person's hand has a sore and holds poison, the poison enters following it; if there is no sore, the poison will not enter. The sore is the causal condition of bodhi, and the poison is the supreme wondrous medicine."