Letter to Eileen Danniheisser (1953), quoted in Albert Einstein: Creator and Rebel by Banesh Hoffman (1973), p. 261 http://books.google.com/books?id=sdDaAAAAMAAJ&q=%22think+with+fear%22#search_anchor. The exact date, or the name of his correspondent, is not given in the snippet of the book available online, but the quote appears after the letter to the Queen of Belgium from 12 January 1953, and is prefaced by "Nine months later, in words that recall the beliefs of an early atomic speculator, the Roman poet Lucretius, Einstein had written to an inquirer", followed by the quote. The name "Eileen Danniheisser" is given in Time: Volume 144, where it is mentioned in the snippets here http://books.google.com/books?id=JDAnAQAAIAAJ&q=%22obsessive+thoughts%22#search_anchor and here http://books.google.com/books?id=JDAnAQAAIAAJ&q=%22think+with+fear%22#search_anchor that she had written Einstein "about her obsessive thoughts of death as a child".
1950s
“Fear is of two kinds, viz., natural or rational fear, when there is a threatening situation to endanger life; and unnatural or unusual fear which has no objective reality.”
Conquest of Fear (c-1960)
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Swami Sivananda 41
Indian philosopher 1887–1963Related quotes
“When fear has seized upon the mind, man fears that only which he first began to fear.”
Ubi intravit animos pavor, id solum metuunt, quod primum formidare cœperunt.
IV, 16, 17.
Historiarum Alexandri Magni Macedonis Libri Qui Supersunt, Book IV
The Reappearance of the Christ and the Masters of Wisdom (1980)
"Supernatural Horror in Literature" (1927)
Non-Fiction
Variant: The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown
Source: The Complete Fiction of H.P. Lovecraft
5th Public Talk, Amsterdam, The Netherlands (30 May 1967)
1960s
As quoted in "Constance Wu Opens Up About Activism and Speaking Up For What’s Right" in Teen Vogue (27 February 2017) https://www.teenvogue.com/story/constance-wu-activism-speaking-up-whats-right-big-hundred-mirys-list
The New Day: Campaign Speeches of Herbert Hoover (1928), Campaign speech in New York (22 October 1928)