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劍鞘保護劍的鋒利，自己卻滿足於它自己的遲鈍。

I think that we communicate only too well, in our silence, in what is unsaid, and that what takes place is a continual evasion, desperate rearguard attempts to keep ourselves to ourselves.

The first rule of quality is that it must be defined.

古今的變化，不是改變其根本道理，而是改變其方法。

在戰(zhàn)爭中，沒有贏家，只有幸存者。

獎賞不正確，沒有鼓勵作用；施刑不正確，也起不到懲戒作用。