Why other people's opinions don't matter at all

It's a cosmic accident that you happen to be alive at this particular time. You could have just have easily been born a hundred years earlier, or a hundred years later. Think about the kinds of things people believed a hundred years ago, or might believe a hundred years from now. Would you agree with much of them?

Do the things people believed a hundred years ago bother you today? Should anything anyone else believes now or in the future bother you today?

Related: Thinking.