[cóng shàn rú dēng]   

从    善    如    登    指为善如登山那样不易，比喻学好很难。

从善如登山：登：升高。顺从好的就像登高一样，比喻学好不容易，要花力气，表示做好事很不容易。

To pursue goodness is as difficult as ascending a mountain

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