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实现明天理想的唯一障碍是今天的疑虑。
The only limit to our realization of tomorrow is our doubts of today.
It is the duty of the human understanding to understand that there are things which it cannot understand.
The secret of all effective advertising is not the creation of new and tricky words and pictures, but one of putting familiar words and pictures into new relationships.
数学和计算机科学之间的相互作用是深刻而美丽结果的丰富源泉。
我认为对古代好的东西要阐述奖惩,对现在好的东西要创造,不过是希望好的东西越来越多罢了。 
The devil doesn’t need horns to be dangerous.