At a given moment, the time may simply not be ripe to solve a particular problem. Progress on something else might be needed first, and the necessary clue might come from a different direction. In the case of quantum gravity, the unexpected direction was string theory.

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