“After more than a quarter-century as a professional economist, I have a confession to make: There is a lot I don’t know about the economy. Indeed, the area of economics where I have devoted most of my energy and attention — the ups and downs of the business cycle — is where I find myself most often confronting important questions without obvious answers.”

Source: Deathworld (1960), p. 113
Context: "What about it, Meta?" he snapped. "No doubts? Do you think that destruction is the only way to end this war?"
"I don't know," she said. "I can't be sure. For the first time in my life I find myself with more than one answer to the same question."
"Congratulations," he said. "It's a sign of growing up."

On rumors that he wanted a guest role as a villain on the BBC TV series Doctor Who.
A chat with Meat Loaf (2006)

Booknotes interview (1994)

Source: Green Mars (1993), Chapter 8, “Social Engineering” (p. 401)

Source: Beach Music

Quoted in The Algonquin Wits, (1968) by R E Drennan, p. 5

As quoted by Sidney A. Pearson, Jr. in the 2004 introduction to Party Government: American Government in Action