He that lives upon his wits, breaks for want of stock.

Meaning: A person relying solely on cleverness without resources or preparation will eventually fail when quick thinking alone cannot sustain them.

Origin: Recorded in A Dictionary of English Proverbs and Proverbial Phrases, an undated collection published in London by Whittaker & Co. around 1880 and credited to Thomas Preston. Its earlier history hasn't been traced.

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