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譯文：種植橘柚，吃起來是甜的，聞起來是香的；種植枳棘，長大了卻會刺人。所以君子要謹慎地選擇所要培養的人才。

The existence of life is ephemeral, so cherishing the present moment is crucial.

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.