At every period of history, people have believed things that were just ridiculous, and believed them so strongly that you risked ostracism or even violence by saying otherwise. If our own time were any different, that would be remarkable. As far as I can tell it isn't.

If you want to learn about a certain era, their morals, their ethics, their beliefs, look at their literature

Whether a man is a criminal or a public servant is purely a matter of perspective.

If anyone, no matter who, were given the opportunity of choosing from amongst all the nations in the world the set of beliefs which he thought best, he would inevitably—after careful considerations of their relative merits—choose that of his own country. Everyone without exception believes his own native customs, and the religion he was brought up in, to be the best.

The greatness of a nation and its moral progress can be judged by the way its animals are treated.

Morality—like velocity—is relative. The determination of it depends on what the objects around you are doing. All one can do is measure one's position in relation to them; never can one measure one's velocity or morality in terms of absolutes.