From a letter to Hermann Huth, Vice-President of the German Vegetarian Federation, 27 December 1930. Supposedly published in German magazine Vegetarische Warte, which existed from 1882 to 1935. Einstein Archive 46-756. Quoted in The Ultimate Quotable Einstein by Alice Calaprice (2011), [//books.google.it/books?id=G_iziBAPXtEC&pg=PA453 p. 453]. 
1930s 
Context: Besides agreeing with the aims of vegetarianism for aesthetic and moral reasons, it is my view that a vegetarian manner of living by its purely physical effect on the human temperament would most beneficially influence the lot of mankind.
                                    
“Besides agreeing with the aims of vegetarianism for aesthetic and moral reasons, it is my view that a vegetarian manner of living by its purely physical effect on the human temperament would most beneficially influence a lot of mankind.”
            From a letter to Hermann Huth, Vice-President of the German Vegetarian Federation, 27 December 1930. Supposedly published in German magazine Vegetarische Warte, which existed from 1882 to 1935. Einstein Archive 46-756. Quoted in The Ultimate Quotable Einstein by Alice Calaprice (2011), [//books.google.it/books?id=G_iziBAPXtEC&pg=PA453 p. 453]. ISBN 978-0-691-13817-6 
1930s
        
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Albert Einstein 702
German-born physicist and founder of the theory of relativi… 1879–1955Related quotes
"Letter from Thay", Blue Cliff Monastery http://www.plumvillage.org/HTML/news/letterfromThay.html (12 October 2007)
"Michael Clarke Duncan's Exclusive Interview With PETA", video on PETA's YouTube channel (10 May 2012) https://www.youtube.com/watch?v=iGh2_qgYJd8.
Interview on The Bonnie Hunt Show (20 October 2008) https://www.youtube.com/watch?v=7P9qda1IH3Y.
Reported in Judaism and Vegetarianism by Richard H. Schwartz (New York: Lantern Books, 2001), in the “ Statements of support https://archive.org/stream/JudaismAndVegetarianism#page/n3/mode/2up” section.
                                        
                                        Speech at Meeting of London Vegetarian Society (20 November 1931), in The Collected Works of Mahatma Gandhi (New Delhi: Publications Division Government of India, 1999 electronic edition),  Volume 54 http://www.gandhiashramsevagram.org/gandhi-literature/mahatma-gandhi-collected-works-volume-54.pdf, p. 189. 
1930s
                                    
“I am a vegetarian for health reasons—the health of the chicken.”
Singer was very devoted to the vegetarian cause and was frequently quoted as saying this statement, as reported in Judaism and Vegetarianism by Richard H. Schwartz (New York: Lantern Books, 2001, ISBN 1-930051-24-7), p. 177 https://books.google.it/books?id=zo5TqKQVcEgC&pg=PA177
“I think that on the whole man would be living a more natural life if he were a vegetarian.”
Interview with Rynn Berry
Source: undated quotes, Tàpies, Werke auf Papier 1943 – 2003,' (2004), p. 24.