《列子·黄帝》
所以上古有句话说：刚强，是认为外物不如自己的；柔弱，却是认为外物胜过自己的。
故上古之言：强，先不己若者；柔，先出于己者。
Therefore, there was an ancient saying: Forcefulness means thinking that external things are not as good as oneself; gentleness is thinking that external things are better than oneself.