a riddle wrapped up in an enigma
A form of Winston Churchill's quotation, made in a radio broadcast in October 1939:
- "I cannot forecast to you the action of Russia. It is a riddle, wrapped in a mystery, inside an enigma; but perhaps there is a key. That key is Russian national interest."
- (idiomatic) Something very mysterious and hidden.
- “The meaning and origin of the expression: A riddle wrapped up in an enigma”, in (Please provide the title of the work), phrases.org.uk, 17 March 2009, retrieved 13 March 2017