《太平广记·卷三十八·神仙三十八》
李泌就说道： 方就象行义，圆就象用智，动就象逞才，静就象遂意。 
泌乃言曰： 方如行义，圆如用智，动如逞才，静如遂意。 
Li Bi then said: Square is like conforming to principles, round is like using wisdom, motion is like showing off talent, stillness is like getting what you want.