The uncertainty of the future is inescapable, one must think about it and arrive at plans for action. A statement attributed to a number of thinkers is, "Prediction is very difficult, especially of the future." Postdiction, knowing what went on in the past, is also difficult. The past, however, is our basis for understanding the future.

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