in  La formation scientifique, Une communication du Prix Nobel d’économie, Maurice Allais http://www.canalacademie.com/Maurice-Allais-la-formation.html, address to the Académie des Sciences Morales et Politiques (1997). 
Context: Any author who uses mathematics should always express in ordinary language the meaning of the assumptions he admits, as well as the significance of the results obtained. The more abstract his theory, the more imperative this obligation.
In fact, mathematics are and can only be a tool to explore reality. In this exploration, mathematics do not constitute an end in itself, they are and can only be a means.
                                    
“Aristotle would… by no means admit that mathematics was divorced from aesthetic; he could conceive, he said, of nothing more beautiful than the objects of mathematics.”
            Preface p. v 
A History of Greek Mathematics (1921) Vol. 1. From Thales to Euclid
        
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Thomas Little Heath 46
British civil servant and academic 1861–1940Related quotes
                                        
                                        [Amir D. Aczel, The Artist and the Mathematician, http://books.google.com/books?id=fRCH-at7wgYC&pg=PA53, 29 April 2009, Basic Books, 978-0-7867-3288-3, 54] 
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Source: Die Mathematik die Fackelträgerin einer neuen Zeit (Stuttgart, 1889), p. 39.
                                        
                                        Curriculum Vitae (1843) 
Context: What attracted me so strongly and exclusively to mathematics, apart from the actual content, was particularly the specific nature of the mental processes by which mathematical concepts are handled. This way of deducing and discovering new truths from old ones, and the extraordinary clarity and self-evidence of the theorems, the ingeniousness of the ideas... had an irresistible fascination for me. Beginning from the individual theorems, I grew accustomed to delve more deeply into their relationships and to grasp whole theories as a single entity. That is how I conceived the idea of mathematical beauty...
                                    
                                        
                                        Introduction, The Nature of Probability Theory, p. 3. 
An Introduction To Probability Theory And Its Applications (Third Edition)
                                    
                                        
                                        The evolutionary modification of genetic phenomena. Proceedings of the 6th International Congress of Genetics 1, 165-72, 1932. 
1930s
                                    
Source: 1950s, Portraits from Memory and Other Essays (1956), p. 53
Source: Quotes of Salvador Dali, 1961 - 1970, Diary of a Genius (1964), p. 81
                                        
                                        Graham Greene "Frederick Rolfe: Edwardian Inferno" (1934); cited from Collected Essays (New York: The Viking Press, 1969) p. 175 
Criticism