俱舍論記 10.215

10.215

「以無第四至外器三災」者，答中兩解：一約內身有三災患，謂風、熱、痰，水增痰病起，火增熱病起，風增風病起。醫方中說身有三分，心已上痰分，心已下臍上熱分，臍已下風分。第二約外器亦有三災，火、水、風三似外三災。地界非災，故無斷用。

Regarding "Because there is no fourth ... the three calamities of the external receptacle": in the answer there are two explanations. First, in terms of the internal body there are three calamities and disorders, namely wind, heat (bile), and phlegm: when water increases, phlegm disorders arise; when fire increases, heat disorders arise; when wind increases, wind disorders arise. Medical texts state that the body has three divisions: from the heart upward is the phlegm division, from below the heart to above the navel is the heat division, and from below the navel downward is the wind division. Second, in terms of the external receptacle world there are also three calamities: fire, water, and wind resemble the three external calamities. The earth element is not a calamity, so it lacks the function of severing.