Karl Popper Quotes about Fighting

Karl Popper (2014). “Conjectures and Refutations: The Growth of Scientific Knowledge”, p.501, Routledge
Karl Popper (2014). “Conjectures and Refutations: The Growth of Scientific Knowledge”, p.465, Routledge
Karl Popper (2012). “The Open Society and Its Enemies”, p.38, Routledge