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Knowing is not enough; we must apply. Willing is not enough; we must do.
Johann Wolfgang von Goethe(1749-1832); German poet and dramatist

(来源：英语麦当劳－英语学习门户 EnglishCN.com)

Facts are stubborn things.
Tobias Smollett(1721-1771), Scottish writer and surgeon. (来源：英语聊天室 http://chat.EnglishCN.com)