There are only two kinds of scholars; those who love ideas and those who hate them. - Emile Chartier--
idea
1430, "figure, image, symbol," from L. idea "idea," and in Platonic philosophy "archetype," from Gk. idea "ideal prototype," lit. "look, form," from idein "to see," from PIE *wid-es-ya-, suffixed form of base *weid- "to see" (see vision). Sense of "result of thinking" first recorded 1645.
"Men of one idea, like a hen with one chicken, and that a duckling." [Thoreau, "Walden"]
ideal
1410, from L.L. idealis "existing in idea," from L. idea in the Platonic sense (see idea). Sense of "perfect" first recorded 1613. The noun meaning "perfect person or thing" is first recorded 1796 in a translation of Kant. The abstract idealism, also from 1796, originally meant "belief that reality is made up only of ideas." Idealist "one who represents things in an ideal form" is from 1829, as is idealistic. Ideally "in the best conceivable situation" is from 1840. Idée fixe (1836) is from Fr., lit. "fixed idea."
ideology
1796, "science of ideas," originally "philosophy of the mind which derives knowledge from the senses" (as opposed to metaphysics), from Fr. idéologie "study or science of ideas," coined by Fr. philosopher Destutt de Tracy (1754-1836) from idéo- "of ideas," from Gk. idea (see idea) + -logy. Meaning "systematic set of ideas, doctrines" first recorded 1909. Ideologue first recorded 1815, in ref. to the Fr. Revolutionaries.
"Ideology ... is usually taken to mean, a prescriptive doctrine that is not supported by rational argument." [D.D. Raphael, "Problems of Political Philosophy," 1970]
