Strength does not follow the heart. It means being physically unable to do what one wishes to do.
心里想做，可是力量够不上。
《后汉书·西域传》今使者大兵未能得出，如诸国力不从心，东西南北自在也。”
He wanted to climb the mountain, but his old age made him feel 力不从心.
Learn the next connected idiom: 力不从心 (lì bù cóng xīn) → 心有余悸 (xīn yǒu yú jì)
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