It is only with the heart that one can see clearly the essence of things, what is essential is invisible to the eye.
只有用心灵才能看得清事物本质，真正重要的东西是肉眼无法看见的。
In a sense, it does not exist in our brain, which means that you can not see the past things, but you can obtain and strengthen the ability to understanding the invisible things by learning history.
历史讲的是过去的事情，从某种意义上来说，历史并不存在于脑中-就是说，你看不到过去的事情；但是学习历史能使你得到并增强理解不在眼前的事物的能力。
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