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“You can never characterize anybody’s personality in detail. There should always be hidden and unknown aspects of any personality that can put you to confusion. However, you can nearly take it for guaranteed that if whoever is less talkative and sensitive, he/she is more aggressive and sadist by nature, because human brain is designed so that if cells in the communication and emotion centers there are killed off, the cells in the sex and aggression centers will grow. There is a proportion between these centers, which means that if one contains more neurons, the other does less. This negative personality trait can be hidden with the naked eye, but it exists in all probability.”