首楞嚴義疏注經 8.35

8.35

"Poisonous snakes and bitter enemies can kill the physical body, but they cannot harm the Dharma-body. Lust can harm the Dharma-body and the life of wisdom; a true practitioner must cut it off forever. The Nirvāṇa Sūtra states: 'The bodhisattva contemplates sexual craving as having nine kinds of faults and perils: first, like an outstanding debt; second, like a rākṣasī wife; third, like a poisonous snake on the stem of a wondrous flower; fourth, like unwholesome food contrary to one's constitution that one is forced to eat; fifth, like a courtesan; sixth, like a māluka plant; seventh, like proud flesh in an ulcer; eighth, like a violent gale; ninth, like a comet.' The subsequent text states: 'The tathāgatas of the ten directions describe the practice of lust unanimously as fire of desire; bodhisattvas regard desire as though avoiding a pit of fire.'"