The Manners of Kings
because wise men have said: 'Do not give so much strength to thy friend that, if he becomes thy foe, he may injure thee.' Hast thou not heard what the man who suffered molestation from one whom he had educated: 'Either fidelity itself does not exist in this world or nobody practises it in our time; no one has learnt archery from me without at last making a target of me.'"
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