No natural boundary seems to be set to the efforts of man; and what is not yet done is only what he has not yet attempted to do.

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Variants

What is not yet done is only what we have not yet attempted to do.

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Attribution

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