Denial has no survival value.
“…since ‘pure’ truth not only does not exist, it has no survival value whatsoever.” (Wilden, 1972 & 1980, p.303).
Although often credited to Lieutenant Colonel Dave Grossman talking about violent encounters (Buckeye Firearms Association, 2015):
“Denial kills you physical, mentally, and financially. It has no survival value. Chew it up, spit it out, get rid of it. This is the moment of truth. No more denial. Rid yourself of every ounce.”
One of Grossman’s Five Ds (Wyllie, 2010):
“1. Denial — Denial is the enemy and it has no survival value, said Grossman.”
I then found this (Brainy Quote, 2015) credited to C.S. Lewis (1898-1963):
“Friendship is unnecessary, like philosophy, like art… It has no survival value; rather it is one of those things that give value to survival.”
Brainy Quote (2015) C.S. Lewis Quotes. Available from World Wide Web: http://www.brainyquote.com/quotes/quotes/c/cslewis105239.html. [Accessed: 13 December, 2015].
Buckeye Firearms Association (2015) Bulletproof your mind with Col. Dave Grossman! Available from World Wide Web: http://events.r20.constantcontact.com/register/event;jsessionid=F09A2E9CDB99DEEB07E1B63602F012BF.worker_registrant?llr=vlnbpzcab&oeidk=a07e79f4etz39ec9bfd. [Accessed: 13 December, 2015].
Wilden, A. (1980) System and Structure: Essays in Communication and Exchange. 2nd ed. Oxon: Routledge.Wyllie, D. (2010) Be Advised… Available from World Wide Web: https://www.policeone.com/school-violence/articles/2058168-Active-shooters-in-schools-The-enemy-is-denial/. [Accessed: 13 December, 2015].