…But he still thought it self-evident that one had to do what was right; he had never learned how people could want to do otherwise; he had learned only that they did. It still seemed simple and incomprehensible to him: simple that things should be right, and incomprehensible that they weren’t.

Atlas Shrugged by Ayn Rand

Just started reading Atlas Shrugged and loved this passage, because I too, believe it.