The document defines and provides background on various idioms, sayings, and references including:
- Reading the riot act refers to dispersing noisy gatherings from 1715 British law.
- A riddle wrapped in a mystery inside an enigma was Churchill's description of Russia, implying it is confusing.
- Mantras in Hinduism and Buddhism are sacred words chanted in devotion and meditation.
- Jekyll and Hyde refers to having two opposing personalities from Robert Louis Stevenson's 1886 novel.
- Letting a hundred flowers bloom was Mao's invitation to diverse opinions in 1957 China.