An important scientific innovation rarely makes its way by gradually winning over and converting its opponents: What does happen is that the opponents gradually die out.
Source: In Shorter Bartlett's Familiar Quotations, by John Bartlett, 1937, 1980, 1992.
-- Max Planck, (Apr 23 1858-1947), German physicist; He pioneered modern physics by proposing the quantum theory, 1900-01; won 1918 Nobel Prize.