“Believe me, nurse, the difficulty of beginning will be nothing to the difficulty of knowing how to stop.”
Dr Reilly
Murder in Mesopotamia (1936)
Context: Believe me, nurse, the difficulty of beginning will be nothing to the difficulty of knowing how to stop. At least that's the way it is with me when I have to make a speech. Someone's got to catch hold of my coat-tails and pull me down by main force.
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Agatha Christie 320
English mystery and detective writer 1890–1976Related quotes

Addressing Rudolph Höss, perhaps in July 1942, during a visit to Birkenau POW camp (Kriegsgefangenenlager), where the inmates' and guards' deficient living conditions were pointed out, from Höss's autobiography http://holocaustcontroversies.blogspot.com/2006/04/correction-corner-2-himmlers-visit-to.html written in a Polish prison, Death Dealer: The Memoirs of the SS Kommandant at Auschwitz, pp. 286ff. (1996)
1940s

Space, Time and Gravitation (1920)
Context: It is of interest to inquire what happens when the aviator's speed... approximates to the velocity of light. Lengths in the direction of flight become smaller and smaller, until for the speed of light they shrink to zero. The aviator and the objects accompanying him shrink to two dimensions. We are saved the difficulty of imagining how the processes of life can go on in two dimensions, because nothing goes on. Time is arrested altogether. This is the description according to the terrestrial observer. The aviator himself detects nothing unusual; he does not perceive that he has stopped moving. He is merely waiting for the next instant to come before making the next movement; and the mere fact that time is arrested means that he does not perceive that the next instant is a long time coming.<!--p.26

“He who thinks with difficulty believes with alacrity.”
Source: Epigrams, p. 363

“My difficulty is only an — enormous — difficulty of expression.”
Journal entry (8 March 1915) p. 40
1910s, Notebooks 1914-1916

“The difficulty in philosophy is to say no more than we know.”
Source: 1930s-1951, The Blue Book (c. 1931–1935; published 1965), p. 45

“How did I escape? With difficulty. How did I plan this moment? With pleasure.”
Source: The Count of Monte Cristo

La principale difficulté pour vulgariser la physique quantique, c'est qu'on ne sait pas très bien comment en fabriquer des images dans notre monde. C'est en ce sens qu'elle est vraiment contre-intuitive.
Interview http://www.canalacademie.com/Alain-Aspect.html on the occasion of the CNRS Gold Medal Award Ceremony in December 2005.

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Remembering Our Leaders: Mahadeo Govind Ranade by Pravina Bhim Sain