
Statement recorded in the diary of his companion Johanna Fantova, quoted at the end of the New York Times story "From Companion's Lost Diary, A Portrait of Einstein in Old Age" http://www.nytimes.com/2004/04/24/nyregion/from-companion-s-lost-diary-a-portrait-of-einstein-in-old-age.html?pagewanted=all&src=pm by Dennis Overbye (24 April 2004)
Attributed in posthumous publications