To evaluate if a goal is worth,we should consider about several problems.at first,the target will take how much benefit to us,the more benifit bring ,the goal is more worth to achieve.futhermore,if the return from the goal is smaller than the expend,this goal is not worth to gain it.at last,we should engage in the reasonable goal,some goal is not good for the society,that will be rejiected.Some people believe that if a goal is worth to achieve,it can be attain by any means.i would claim that we should attain our goal by reasonable method.if we take any means to gain our goal,the world will be in chaos.
     The reason for this is that we can not get our goal by extreme method.if merchant sell goods as a high price not as the standard regulation,most of us can not afford to buy it.the seller get a high profit.but for most customer,this is not beneficial and unfair for them,they can not get such goods because of  the price.the merchant only care about his benifit and ignore the customer's feeling.so obvious the merchant's goal is earn money,but if he overlook the customer's purchasing power,only focus on the benefit they get,it is not a goal should be chased.
  so we should establish some good goals instead of harmful goals.thai is ,we should avoid  some unjustifiable goals and build a goal by proper means.maybe some reasonable goals is not worth to do from superficial,but it's potential benifit is huge.futhermore,some unreasonable goals is worthy to do is good for them directly.but it will be harm to other people.for instance,a football palyer get a bribe,then he make the team lost the match,it will hurt their teammate,coach and spectators,lead their fan do not trust the team anymore.so we need to set up a good goals to attend,or we will step on the wrong way.
  in a word,if a goal is reasonable and worthy,we would obtain it by any means.only in this way are we able to built a  harmonious society.