“To win a championship, you've got to have a nucleus of five or six real tough, hard competitors. To win anything, the team's got to think tough and that infiltrates into the individual. You've got to have a tough leader.”

Part III, Searching For Scale, Four-Door Office, p. 105.
Running Money (2004) First Edition
Context: A product lowers the cost of doing something and eventually, customers will figure this out and buy the stuff in big volume, but they're not going to buy yet. You've got to have real conviction to step up and own this kind of company-you're staring over the edge of the waterfall, not sure when the growth is going to start.

Source: Hoffa The Real Story (1975), Chapter 5, The Spoiled Brat, p. 92

As quoted in Halliwell’s Filmgoer’s Companion (1984) Leslie Halliwell
Variant: Sex appeal is fifty percent what you've got and fifty percent what people think you've got.

As quoted in "The Paternal Pride of Maurice Sendak" by Bernard Holland, in The New York Times (8 November 1987) http://query.nytimes.com/gst/fullpage.html?res=9B0DE6DC103CF93BA35752C1A961948260&scp=2&sq=Sendak+protecting&st=nyt
Context: Children are tough, though we tend to think of them as fragile. They have to be tough. Childhood is not easy. We sentimentalize children, but they know what's real and what's not. They understand metaphor and symbol. If children are different from us, they are more spontaneous. Grown-up lives have become overlaid with dross.

David R. Brower, in an interview with Terkel, but much of it is sometimes misattributed to Terkel himself.
Misattributed