《墨子·13章 尚同(下)》
这样人都认为自己的道理正确，而认为别人的道理不正确，因此严重的发生斗殴，轻微的发生争吵。
此皆是其义，而非人之义，是以厚者有斗，而薄者有争。
In this way, each person regard his own principles as correct, but he regarded the principles of the others as incorrect, thus, serious fights broke out between them, while minor quarrels constantly occurred.