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釋義：當對知識的理解達到真實、確切、堅定的程度時，這種理解就會體現為具體的行動；而在行動中能做到明白、警覺、精細、明察的地步，這也反映了對相關知識的掌握。

In every real man a child is hidden that wants to play.

States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.

幸福的秘訣是面對這個世界很可怕的事實。