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Reason obeys itself; and ignorance submits to whatever is dictated to it.
理性服从自己;而无知则服从任何强加于它的东西。
The only way to learn mathematics is to do mathematics.
The past is always tense, the future perfect.
法律的存在是一回事;其优劣是另一回事。
The difference between good and great is the extra effort.