摩訶止觀 8.88

8.88

正用治病者：丹田是氣海，能鎖吞萬病。若止心丹田，則氣息調和，故能愈疾，即此意也。又有師言：「上氣胸滿、兩脅痛、背膂急、肩井痛，心熱懊痛、煩不能食、心瘇、臍下冷、上熱、下冷、陰陽不和、氣嗽，右十二病皆止丹田。」丹田去臍下二寸半，或痛切者，移心向三里；痛又不除，移向兩脚大拇指爪橫文上，以差為度。

Regarding its direct use to treat illness: the dantian is the sea of qì and can lock down and swallow myriad diseases. If one calms the mind in the dantian, the breath and qì are regulated and harmonious, and thus it can cure disease; this is the meaning. Another master said: "Ascending qì with fullness in the chest, pain in both flanks, tightness in the back and spine, pain at the shoulder well, distressing heat and pain in the heart, agitation preventing eating, swelling of the heart, cold below the navel, heat above and cold below, discord between yin and yang, and qì-induced cough—the above twelve diseases are all treated by calming [the mind] in the dantian." The dantian is two and a half inches below the navel. If the pain is acute, move the mind toward the zusanli point; if the pain is still not eliminated, move it to the horizontal creases on the toenails of both great toes, taking recovery as the standard.