Fundamental assumptions in general and scientific assumptions in particular are so hard to overturn because they are based on belief. Beliefs are so hard to overcome because they are irrational and therefore do not yield to logical argument.
Thomas CampbellOn the green banks of Shannon, when Sheelah was nigh, No blithe Irish lad was so happy as I, No harp like my own could so cheerily play, And wherever I went was my poor dog Tray.
Thomas Campbell