《北史·本记·卷二》
众官上奏皇帝，请他按照《周易》中所说的高险的意图而加高城墙和深挖护城河，并且引用汉代萧何建宫殿使京城壮丽的故事。太武帝说： 古人曾经说过，治国在德不在险。
群臣白帝，更峻京邑城隍以从《周易》设险之义，又陈萧何壮丽之说。帝曰： 古人有言，在德不在险。
All the officials played the Emperor, asking him to follow the dangerous intentions in the "Book of Changes" to raise the city walls and dig the moat, and cited the story of Xiao He building a palace to make the capital magnificent in the Han Dynasty. Emperor Taiwu said: The ancients once said that governing the country depends on virtue, not danger.