Groucho Marx? Spike Milligan? Lydia Augusta Arsens? Tramp Starr? Dr. Parr? John Conolly? John Stuart Blackie? Tom Chalmers? Anonymous?

Question for Quote Investigator: The word “cracked” has several slang meanings. The traditional slang meaning is crazy, foolish, or eccentric. Here are three versions of a comical saying which uses wordplay:
(1) You’ve got to be cracked to let the light in.
(2) Blessed are the cracked, for they shall let in the light.
(3) They were certainly cracked: but the crack let in light.
This quip has been attributed to Irish comedian Spike Milligan, Canadian politician Lydia Augusta Arsens, U.S comedian Groucho Marx, pseudonymous humorist Tramp Starr, Scottish classical scholar John Stuart Blackie, and others. Would you please explore this topic?
Reply from Quote Investigator: The earliest match found by QI appeared in an 1830 book titled “An Inquiry Concerning the Indications of Insanity” by John Conolly, Professor of Medicine at the University of London. Boldface added to excerpts by QI:1
Every county presents one or more specimens of individuals who are reputed scientific by those more ignorant of science than themselves; eccentric men, whose wandering attention has travelled over every subject … in the opinion of their neighbours, they become accounted “wonderfully clever men, but certainly a little mad.” The learned and benevolent Dr. Parr used to say of such men, that they were certainly cracked: but that the crack let in light;—and even then, it is to be feared, he estimated them too highly.
Dr. Parr probably corresponded to English scholar Samuel Parr who died in 1825. Parr is currently the leading candidate for coiner of this quip.
In 1841 English surgeon Walter Cooper Dendy published “The Philosophy of Mystery” which included a student character named Astrophel. This character credited the quip to Samuel Parr:2
But say, if there be (in vulgar words) a crack in this cranium of mine, may not this crack, as saith the learned Samuel Parr, “let in the light?”
If prophetic visions in the early ages came over the dying, why not in ours?
Below are additional selected citations in chronological order.
Continue reading “Quip Origin: Blessed Are the Cracked for They Shall Let in the Light”







