纪昌向飞卫学射箭，飞卫没有传授具体的射箭技巧，却要求他必须学会盯住目标而眼睛不能眨动，纪昌花了两年，练到即使椎子向眼角刺来也不眨一下眼睛的工夫。
飞卫又进一步要求纪昌练眼力，标准要达到将体积较小的东西能够清晰地放大，就像在近处看到一样。纪昌苦练三年，终于能将最小的虱子看成车轮一样大，纪昌张开弓，轻而易举地一箭便将虱子射穿。飞卫得知结果后，对这个徒弟极为满意。
成功心得：
做什么事情也得预先有个目标，这样才不至于半途而废。
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