As quoted in "Lewis Mumford Remembers" by Carey Winfrey in The New York Times (6 July 1977)

I'm a pessimist about probabilities, I'm an optimist about possibilities.

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Attribution

Quote text and notes from Wikiquote: Lewis Mumford (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.