欲壑难填

bottomless pit of desire (idiom); insatiable greed / carnal cravings are never satisfied and are a main obstruction on the path to enlightenment

(idiom) insatiably greedy

desire / appetite / passion / lust / greed

to wish for / to desire / variant of 慾|欲[yu4]

gully / ravine / Taiwan pr. [huo4]

difficult (to...) / problem / difficulty / difficult / not good

disaster / distress / to scold

to fill or stuff / (of a form etc) to fill in