力不从心 [lì bù cóng xīn]
1 心里想做,但能力达不到。
例 今使者大兵未能得出,如诸国力不从心,东西南北自在也。——《后汉书·西域传》
英 ability falling short of one's wishes; ability not equal to one's ambition; lack the ability to do what one would like to do; the spirit indeed is willing, but the flesh is weak;
1 想做某事而力量达不到。