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Psychology must be a science of functions, not just a science of facts.

The preservation of the means of knowledge among the lowest ranks is of more importance to the public than all the property of all the rich men in the country.

每個項目都是新的挑戰，新的學習機會。

A chain is no stronger than its weakest link, and life is after all a chain.

解釋：做大事的不做小事，要成就大事的不成就小事。