It may be true in the case of autism that if you start off with a deficit in terms of empathy or mind reading, you've just got more time to devote to understanding the world by systemizing.

If we understand the mechanisms and motives of the group mind, it is now possible to control and regiment the masses according to our will without their knowing it In almost every act of our daily lives, whether in the sphere of politics or business, in our social conduct or our ethical thinking, we are dominated by the relatively small number of persons who understand the mental processes and social patterns of the masses. It is they who pull the wires which control the public mind.

Since [narcissists] deep down, feel themselves to be faultless, it is inevitable that when they are in conflict with the world they will invariably perceive the conflict as the world's fault. Since they must deny their own badness, they must perceive others as bad. They project their own evil onto the world. They never think of themselves as evil, on the other hand, they consequently see much evil in others.

Psychologists and economists love to talk about the notion of two selves: present self and future self. It's a nice way to explain the tendency to have one preference about the future, but a very different preference when the future becomes the present.

Language and words for psychopaths are only word deep; there is no emotional colouring behind it. A psychopath can use a word like, ‘I love you’ but it means nothing more to him than if he said, ‘I’ll have a cup of coffee.

While people argue with one another about the specifics of Freud's work and blame him for the prejudices of his time, they overlook the fundamental truth of his writing, his grand humility: that we frequently do not know our own motivations in life and are prisoners to what we cannot understand. We can recognize only a small fragment of our own, and an even smaller fragment of anyone else's, impetus.