The beginning, middle, and end of the birth, growth, and perfection of whatever we behold is from contraries, by contraries, and to contraries; and whatever contrarity is, there is action and reaction, there is motion, diversity, multitude, and order, there are degrees, succession and vicissitude
-Giordano Bruno (1548-1600), Italian philosopher. The Expulsion of the Triumphant Beast, "First Dialogue," Introduction (1588).
I happen to feel that the degree of a person's intelligence is directly reflected by the number of conflicting attitudes she can bring to bear on the same topic
-Lisa Alther (b. 1944), U.S. novelist. Ginny Babcock, in Kinflicks, ch. 7 (1976).