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From Ouyang Xiu's (欧阳修, Northern Song) 《伶官传序》 (preface to the Biography of the Actors): 夫祸患常积于忽微，而智勇多困于所溺 - 'disaster builds up from what is slight and unseen; wisdom and courage are often undone by what they indulge in.' A classical reflection on the fall of the Later Tang, now used as a management maxim.
