Often it is only after immense intellectual effort, which may have continued over centuries, that humanity at last succeeds in achieving knowledge of a concept in its pure form, by stripping off the irrelevant accretions which veil it from the eye of the mind.

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