The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.
解释：树冠大了必然会折断，尾巴大了自然不能摆动，这是你知道的道理。
The impact of computer science on society is profound and far-reaching.
