摩訶止觀 7.96

7.96

又復當知：四大成身，二上二下互相違返。地遏水，水爛地；風散地，地遮風；水滅火，火煎水，更相侵害。如篋盛四蛇，癰瘡刺箭，常自是苦，有何可樂？加以飢渴寒熱、鞭打繫縛、生老病死，是為苦苦。四大相侵，互相破壞，是為壞苦。念念流炎，是為行苦。於下苦中橫生樂想，若見苦相分明，如瘡中刺，介介常痛，不於此身生一念樂倒。

Furthermore, one should know: the four elements compose the body, two ascending and two descending, in opposition to one another. Earth blocks water, water rots earth; wind scatters earth, earth obstructs wind; water extinguishes fire, fire boils water, constantly harming one another. It is like a box holding four vipers, or an ulcerous boil pierced by an arrow; it is inherently and constantly suffering, so what pleasure can there be? Added to this are hunger, thirst, cold, heat, whipping, binding, birth, old age, sickness, and death—this is the suffering of suffering. The four elements assailing each other and mutually destroying—this is the suffering of change. Flowing and blazing thought-moment after thought-moment—this is the suffering of conditioned existence. Projecting notions of pleasure onto underlying suffering—if one sees the marks of suffering clearly, like a thorn in a sore constantly causing sharp pain, one will not give rise to a single thought-moment of the inversion of pleasure regarding this body.