Andrew Wilson said this quote

[Patricia Highsmith] was overwhelmed by sensory stimulation - there were too many people and too much noise and she just could not handle the supermarket. She continually jumped, afraid that someone might recognise or touch her. She could not make the simplest of decisions - which type of bread did she want, or what kind of salami? I tried to do the shopping as quickly as possible, but at the check-out she started to panic. She took out her wallet, knocked off her glasses, dropped the money on the floor, stuff was going all over the place.

~ Andrew Wilson

After reading Burgum, [Patricia Highsmith] wrote in her cahier that, like Kafka, she felt she was a pessimist, unable to formulate a system in which an individual could believe in God, government or self. Again like Kafka, she looked into the great abyss which separated the spiritual and the material and saw the terrifying emptiness, the hollowness, at the heart of every man, a sense of alienation she felt compelled to explore in her fiction. As her next hero, she would take an architect, 'a young man whose authority is art and therefore himself,' who when he murders, 'feels no guilt or even fear when he thinks of legal retribution'. The more she read of Kafka the more she felt afraid as she came to realise, 'I am so similar to him.

~ Andrew Wilson

[Patricia Highsmith] was an extremely unbalanced person, extremely hostile and misanthropic and totally incapable of any kind of relationship, not just intimate ones. I felt sorry for her, because it wasn't her fault. There was something in her early days or whatever that made her incapable. She drove everybody away and people who really wanted to be friends ended up putting the phone down on her.It seemed to me as if she had to ape feelings and behaviour, like Ripley. Of course sometimes having no sense of social behaviour can be charming, but in her case it was alarming. I remember once, when she was trying to have a dinner party with people she barely knew, she deliberately leaned towards the candle on the table and set fire to her hair. People didn't know what to do as it was a very hostile act and the smell of singeing and burning filled the room.

~ Andrew Wilson

If [Patricia Highsmith] saw an acquaintance walking down the sidewalk she would deliberately cross over so as to avoid them. When she came in contact with people, she realised she split herself into many different, false, identities, but, because she loathed lying and deceit, she chose to absent herself completely rather than go through such a charade. Highsmith interpreted this characteristic as an example of 'the eternal hypocrisy in me', rather her mental shape-shifting had its source in her quite extraordinary ability to empathise. Her imaginative capacity to subsume her own identity, while taking on the qualities of those around her - her negative capability, if you like - was so powerful that she said she often felt like her inner visions were far more real than the outside world. She aligned herself with the mad and the miserable, 'the insane man who feels himself one with all mankind, all life, because in losing his mind, he has lost his ego, his self-ness', yet realised that such a state inspired her fiction. Her ambition, she said, was to write about the underlying sickness of this 'daedal planet' and capture the essence of the human condition: eternal disappointment.

~ Andrew Wilson