
Variant: Nature shows us only the tail of the lion. But I do not doubt that the lion belongs to it even though he cannot at once reveal himself because of his enormous size.
As quoted by Abraham Pais in Subtle is the Lord:The Science and Life of Albert Einstein (1982), p. 235 ISBN 0-192-80672-6
Source: Letter to Heinrich Zangger (10 March 1914), quoted in The Curious History of Relativity by Jean Eisenstaedt (2006), p. 126 http://books.google.com/books?id=d2bnXTOtCD8C&lpg=PP1&pg=PA126#v=onepage&q&f=false.