Math Quotes - Page 13
Ken Robinson, Lou Aronica (2009). “The Element: How Finding Your Passion Changes Everything”, p.166, Penguin UK
Roald Dahl (2016). “The GFG: The Guid Freendly Giant: The BFG in Scots”, p.145, Black & White Publishing
Ralph Waldo Emerson (2004). “Essays”, p.73, 1st World Publishing
Remark made during a week at Princeton beginning 9 May 1921, later carved above the fireplace of the Common Room of Fine Hall (the Mathematical Institute), Princeton University - in R. W. Clark Einstein (1973) ch. 14
"I Want to be a Mathematician: An Automathography". Book by Paul Halmos, 1985.