Why talk if we disagree?

According to a prevailing dogma of our time, real communication is practically impossible between those who have no common '' cultural language.'' Karl Popper disputed this widespread opinion, arguing that, while it is tremendously difficult to communicate with a real (not artificially constructed) intellectual opponent, at the same time it is infinitely fruitful to do so. He also demonstrated how, while arguing ideologically we improve both our own ideas and the collective knowledge of our society.