"All evils are equal when they are extreme." (Pierre Corneille, "Horace", 1639)
"It is the talent of human nature to run from one extreme to another." (Jonathan Swift, "A Discourse of the Contests and Dissensions Between the Nobles and the Commons in Athens and Rome,", 1701)
"The extreme limit of wisdom — that's what the public calls madness." (Jean Cocteau, "Le Coq et l'Arlequin", 1918)
"Of course she believed the blessed lie, for in times of extreme peril it is human to be optimistic." (Roman F Starzl, "The Planet of Despair", 1931)
"It is not easy to see how the more extreme forms of nationalism can long survive when men have seen the Earth in its true perspective as a single small globe against the stars." (Arthur C Clarke, "The Exploration of Space", 1951)
"The mind can go either direction under stress - toward positive or toward negative: on or off. Think of it as a spectrum whose extremes are unconsciousness at the negative end and hyperconsciousness at the positive end. The way the mind will lean under stress is strongly influenced by training." (Frank Herbert, "Dune", 1965)
"Life would be impossible on such a planet. It wouldn't get enough heat and light, and if it rotated there would be total darkness half of every day. There wouldn't be any native inhabitants. You couldn't expect life - which is fundamentally dependent on light - to develop under such extreme conditions of light deprivation. Half of every axial rotation spent in Darkness! No, nothing could exist under conditions like that." (Isaac Asimov, "Nightfall: and other stories", 1969)
"'It bedevils me sometimes why I am the only one to notice the analogy between historical geology and depth psychology', Terrence Burdock mused as they grew lightly profound around the campfire. 'The isostatic principle applies to the mind and the under-mind as well as it does to the surface and? undersurface of the earth. The mind has its erosions and weatherings going on along with its deposits and accumulations. It also has its upthrusts and its stresses. It floats on a similar magma. In extreme cases it has its volcanic eruptions and its mountain building.'" (Raphael A Lafferty, "Continued on Next Rock", 1970)
"Extremes of any sort are a liability, in terms of evolution. Extreme intellect may be as bad for us as extreme physical size was for the dinosaurs." (Joan Slonczewski, "The Wall around Eden", 1989)
"We are all assumed, these days, to reside at one extreme of the opinion spectrum, or another. We are pro-abortion or anti-abortion. We are free traders or protectionist. We are pro-private sector or pro-big government. We are feminists or chauvinists. But in the real world, few of us holds these extreme views. There is instead a spectrum of opinion." (Michael Crichton, "Mediasaurus: The decline of conventional media", [Speech at the National Press Club] 1993)
"Averages might mean something to bureaucrats and engineers, but the sea had no struck with statistics: it was a succession of unpredictable circumstances and extremes." (Frank Schätzing, "The Swarm", 2004)