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The power of words is that they can create worlds.

Mathematics is not a spectator sport.

孔子說：“譬如堆山，還差一筐，沒堆成就停了，功虧一簣是自己造成的；譬如填坑，只倒一筐，繼續填下去，堅持不懈是自己決定的。”

Man, unlike any other thing organic or inorganic in the universe, grows beyond his work, walks up the stairs of his concepts, emerges ahead of his accomplishments.

數學是給不同事物以相同名稱的藝術。

The greatest gift you can give someone is your time.

Patience is bitter， but its fruit is sweet.

The theory of economic development is the study of how the economic system generates the forces which incessantly transform it.