But the tools of scepticism are generally unavailable to the citizens of our society. They’re hardly ever mentioned in the schools, even in the presentation of science, its most ardent practitioner, although scepticism repeatedly sprouts spontaneously out of the disappointments of everyday life. Our politics, economics, advertising and religions (New Age and Old) are awash in credulity. Those who have something to sell, those who wish to influence public opinion, those in power, a sceptic might suggest, have a vested interest in discouraging scepticism.
— Carl Sagan and Ann Druyan, The Demon-Haunted World: Science as a Candle in the Dark