《礼记·祭义》
孝的极点接近王道，是因为即使是称王的天子也一定孝其父母；悌的极点接近霸道，是因为即使是称霸的诸侯也一定敬其兄弟。
至孝近乎王，虽天子，必有父；至弟近乎霸，虽诸侯，必有兄。
The pinnacle of filial piety approaches the Kingly Way because even the Son of Heaven who rules the country must be filial to his parents; the pinnacle of brotherly love approaches the Hegemonic Way because even the feudal lords who rule the country must respect their brothers.