力不从心

less capable than desirable (idiom); not as strong as one would wish / the spirit is willing but the flesh is weak

power / force / strength / ability / strenuously

no; not so / (bound form) not; un-

from / through / via / to follow / to obey / to engage in (an activity) / never (in negative sentence) / (Taiwan pr. [zong4]) retainer / assistant / auxiliary / subordinate / related by common paternal grandfather or earlier ancestor

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]