"No rational argument will have a rational effect on a man who does not want to adopt a rational attitude"

This quote by Karl Popper suggests that no matter how sensible and well-reasoned an argument may be, it will not be effective in convincing someone who is not open to factor. Popper is emphasizing the importance of having an open and reasonable mindset in order to have the ability to accept and understand logical arguments. He is suggesting that if someone is not going to adopt a logical mindset, then no quantity of logical argument will be able to sway them. This quote highlights the importance of having an open mind and being willing to consider various perspectives in order to be able to make informed decisions. It also recommends that it is not enough to merely exist with truths and figures, but that a person must want to believe critically and objectively in order to have the ability to understand them.