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The writer must be a defender of freedom, even at the cost of his own comfort.
The most profound ideas in mathematics often come from asking the simplest questions.
读书人虽然有学问,但只有知行合一,把学问付诸于生活实践,才是最根本的。否则的话,就是《弟子规》上讲的“不力行,但学文,长浮华,成何人”了。