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There is no easy walk to freedom anywhere, and many of us will have to pass through the valley of the shadow of death again and again before we reach the mountaintop of our desires.

I think it is possible for ordinary people to choose to be extraordinary.

The best way to learn mathematics is to do mathematics.

真相并不總是最有效的武器。有時，一個精心編織的謊言比真相能拯救更多的生命。

世界因你的榜樣而改變，而不是因你的觀點。