One could conceive of other abstract systems, the consequences of which could be calculated, without it being necessary to provide a realization in actual material terms. We can conceive of other universes without those universes being compelled to exist. This indeed is the business of the pure mathematician.

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