内火界 (內火界) nèi huǒ jiè

nèi huǒ jiè phrase internal fire element
Domain: Buddhism 佛教
Notes: Heat within the body; for example, as mentioned in the 象跡喻經 “Sutra of the Great Elephant Footprint Simile” (Thanissaro Bhikkhu tr. 2003 MN 28; T 26, Scroll 7, 1.0465c14; FGDB '內火界')