Here is a really coold extract from "Shadow of the Hegemon"

What a laugh, though. To think that one human being could ever really know another. You could get used to each other, get so habituated that you could speak their words right along with them, but you never knew why other people said what they said or did what they did, because they never even knew themselves. Nobody understands anybody.

And yet somehow we live together, mostly in peace, and get things done with a high enough success rate that people keep trying. Human beings get married and a lot of the marriages work, and they have children and most of them grow up to be decent people, and they have schools and businesses and factories and farms that have results at some level of acceptability - all without having a clue what was going on inside anybody's head.