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The best way to predict the future is to invent it.
The true cost of leather isn't on the price tag—it's measured in water saved, ecosystems preserved, and workers treated fairly.
That is what learning is. You suddenly understand something you've understood all your life, but in a new way.
In mathematics, the simplest questions often lead to the most profound discoveries.
忧伤愁苦,就会心气滞结;忿怨愤怒,就会心气横逆不顺;惊恐畏惧,就会心气沉落不浮;拘谨固执,就会心气郁郁不释;急躁浮躁,就会心气损耗不足。