“When established identities become outworn or unfinished ones threaten to remain incomplete, special crises compel men to wage holy wars, by the cruelest means, against those who seem to question or threaten their unsafe ideological bases.”
"The Problem of Ego Identity" (1956), published in Journal of the American Psychoanalytic Association, 4:56-121
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Erik H. Erikson 8
American German-born psychoanalyst & essayist 1902–1994Related quotes

Hope, Despair, and Memory (1986)

Speech https://www.youtube.com/watch?v=0pfEJaI2iS4 (7 February 2011)
2010s

“The war of the Evil One against the Lord is a war waged against the family.”
Love is a Radiant Light: The Life & Words of Saint Charbel (2019)

Chère amie, ne savez-vous pas que la vertu est un état de guerre, et que, pour y vivre, on a toujours quelque combat à rendre contre soi?
Julie ou la Nouvelle Héloïse http://fr.wikisource.org/wiki/Julie_ou_la_Nouvelle_H%C3%A9lo%C3%AFse/Sixi%C3%A8me_partie#Lettre_VII._R.C3.A9ponse (French), Sixième partie, Lettre VII Réponse (1761)
Julie, or The New Heloise http://books.google.com/books?id=oN6_B_AFhcwC (English), Part Six, Letter VII Response, pg 560

As quoted in Bhagat Singh and His Ideology (1981) by Shiri Ram Bakshi

Speaking about the invasion of Russia http://mentalfloss.com/article/28033/operation-barbarossa-biggest-military-adventure-history.
1940s