《孟子·尽心章句上·第十六节》
但凡他听说有一句善良的话，见到有善良的行为，就立刻身体力行像江河决堤，气势充沛得没有任何东西可以阻挡。 
及其闻一善言，见一善行，若决江河，沛然莫之能御也。 
But whenever he heard a good word or saw a good deed, he immediately acted like a river breaking its banks, and its momentum was so strong that nothing could stop it.
<s>[INST] Kindly elucidate the central themes in this passage in English: 及其闻一善言，见一善行，若决江河，沛然莫之能御也。  [/INST] But whenever he heard a good word or saw a good deed, he immediately acted like a river breaking its banks, and its momentum was so strong that nothing could stop it.</s>
Kindly elucidate the central themes in this passage in English: 及其闻一善言，见一善行，若决江河，沛然莫之能御也。
user
But whenever he heard a good word or saw a good deed, he immediately acted like a river breaking its banks, and its momentum was so strong that nothing could stop it.
assistant