《易传·象传上·噬嗑》
雷电交击，就像咬合一样；雷有威慑力，电能放光明，古代帝王效法这一现象，明其刑法，正其法令。
屦校灭趾，不行也。噬肤灭鼻，乘刚也。
Thunder and lightning strike and bite like pliers; thunder is formidable, while lightning can illuminate. Ancient emperors imitated this phenomenon to make clear their criminal laws and rectify their legal codes.