“I’m not afraid of the darkness outside.
It’s the darkness inside houses I don’t like.”
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Shelagh Delaney 2
English playwright 1938–2011Related quotes
On the themes that she favors in “Dael Orlandersmith on ‘Until the Flood’” https://www.theintervalny.com/interviews/2018/02/dael-orlandersmith-on-until-the-flood/ in The Interval (2018 Feb 1)
“Darkness approaches from outside.
I feel no light inside me strong enough to resist it.”
Source: The Last Vampire

“The world is beautiful outside: white, green, and red; but inside it is black and dark as death.”
Diu welt ist ûzen schoene wîz grüen unde rôt
und innân swarzer varwe vinster sam der tôt.
"Owe war sint verswunden alliu mîniu jâr", line 37; translation from George Fenwick Jones Walther von der Vogelweide (New York: Twayne, 1968) p. 136.

“Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.”
This may be original with Groucho, but the Quote Investigator http://quoteinvestigator.com/category/jim-brewer/ mentions the earliest report found in a 1958 issue of Boy's Life magazine where it is attributed to Jim Brewer.
Misattributed
Variant: Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.
Source: The Essential Groucho: Writings For By And About Groucho Marx
Rich Koz http://www.chicagomag.com/Chicago-Magazine/October-2017/Rich-Koz/ (October 27, 2017)

“I’m calm on the outside and a flood inside.”
Retail therapists (2007)

“Now it's the dark's turn to be afraid.”
Source: Curse of the Bane

“Madison Avenue is afraid of the dark.”
Comment on why his hit NBC TV show couldn't get a national sponsor. (1956) Quoted in article http://www.songwritershalloffame.org/award_recipient_detail.asp?awardRecipientId=44&ceremonyId=4 at the Songwriters Hall of Fame