《论衡·卷十三·效力篇》
宝剑干将的锋刃，人不抽出来使用，连瓜和瓠都不会被损坏；用筱、簵做的箭，弩机不扣动，连鲁缟也不会被射穿。
干将之刃，人不推顿，菰瓠不能伤；筱之箭，机不动发，鲁缟不能穿。
The edge of the precious sword Gan Jiang, if one does not draw it out and use it, even melons and gourds will not be damaged; arrows made of reeds and canes, if the crossbow is not cocked, even thin silk will not be pierced.