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Profit that depletes the planet is no profit at all.
理论的任务不仅是了解自然是什么以及它是如何运作的,而且要尽可能接近理解为什么自然是这样的而不是其他样子的不可达到的目标。
The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when it be obeyed.