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The essence of mathematics lies in its freedom.
The world we see that seems so insane is the result of a belief system that is not working. To perceive the world differently, we must be willing to change our belief system, let the past slip away, expand our sense of now, and dissolve the fear in our minds.
我们开采的每一吨煤炭都必须以最小的环境影响创造最大的价值。
The true teacher defends his pupils against his own personal influence.