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The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart.
世界上最好和最美丽的东西是看不见甚至摸不到的——它们必须用心去感受。
If you want to understand function, study structure.
I would not dare to say that there is a direct relation between mathematics and madness, but there is no doubt that great mathematicians suffer from maniacal characteristics.