riddle wrapped up in an enigma

The phrase "riddle wrapped up in an enigma" is a metaphorical expression that refers to an intricate or extremely puzzling situation or concept. It implies a complex mystery that is difficult to understand or unravel. The phrase originated from a famous quote by Winston Churchill, who used it to describe the secretive nature of Russia during World War II: "I cannot forecast to you the action of Russia. It is a riddle wrapped in a mystery inside an enigma."