There is nothing physical to be learned a priori. We have no right whatever to ascertain a single physical truth without seeking for it physically, unless it be a necessary consequence of other truths already acquired by experiment, in which case mathematical reasoning is alone requisite.

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