Фанатик — это человек, который не может изменить взгляды и не может переменить тему
There is nothing more frightful than ignorance in action
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts
May be related to 7(e) Stubbornness, 13(e) Overconfidence, 13(f) Naivety