《礼记·礼运》
王者前有巫官，后有史官，卜筮之人和乐师谏官跟随在左右，王者处于中央，心思无需多用，只需恪守中正之道而已。
王，前巫而后史，卜筮瞽侑皆在左右，王中心无为也，以守至正。
The king has witches in front, historians behind, diviners and musicians on the left and right, the king is in the center, and he does not need to think much, just stick to the right path.