《菜根谭·概论》
耳朵常常听到不顺耳的话，心里常常想着不顺心的事，有利于增进品德修炼品行。
耳中常闻逆耳之言，心中常有拂心之事，才是进德修行的砥石。
Ears often hear unpleasant words, and minds often think about unpleasant things, which is beneficial to the cultivation of morality and conduct.