The text also shows another form of breach. Not only must one respect other peoples' customs, one must respect their boundaries. So, getting to the quote of the day, we have the Ethiopian king commenting on territorial expansion of the type that Cambyses, and later Xerxes, undertakes:
If he [Cambyses] were a good man, he would not want to possess any land other than his own, and he wouldn't have enslaved people who have done him no wrong. (Herodotus 3.21; trans. Waterfield)
What happened to Cambyses according to Herodotus? Because he failed to respect religious customs and traditions (see 3.38) and political boundaries, he went insane, was overthrown by rebellion at home, and was wounded in the same way that he had sacrilegiously wounded a sacred Apis bull in Egypt (3.64)!