Known sourcecanonical
"The accident of an accident."
Lord Thurlow / Speech in Reply to the Duke of Grafton. Butler's Reminiscences, vol. i. p. 142.
Speech in Reply to the Duke of Grafton. Butler's Reminiscences, vol. i. p. 142.
Bartlett's Familiar Quotations, 9th ed. (Little, Brown, 1905), public domain