“To people at large, life inside the harem was a mystery.”

Source: Every Day

Source: The Witch Of Portobello

BBC broadcast (“The Russian Enigma”), London, October 1, 1939 ( partial text http://www.churchill-society-london.org.uk/RusnEnig.html, transcript of the "First Month of War" speech https://ww2memories.wordpress.com/2011/09/24/churchills-ww2-speech-to-the-nation-october-1939/).
The Second World War (1939–1945)
Context: 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.

Part of his public message upon arrival on his second visit to America (19 May 1932).
General sources

Source: The Witches of Worm

My Way: The Way of the White Clouds (1995)
Context: Look for the mysterious in life. Wherever you look — in the white clouds, in the stars in the night, in the flowers, in a flowing river — wherever you look, look for the mystery. And whenever you find that a mystery is there, meditate on it. Meditation means: dissolve yourself before that mystery, annihilate yourself before that mystery, disperse yourself before that mystery. Be no more, and let the mystery be so total that you are absorbed in it. And suddenly a new door opens, a new perception is achieved.

Source: The Satanic Verses

Source: Sexual Personae: Art and Decadence from Nefertiti to Emily Dickinson (1990), p. 22

BBC broadcast (“The Russian Enigma”), London, October 1, 1939 ( partial text http://www.churchill-society-london.org.uk/RusnEnig.html, transcript of the "First Month of War" speech https://ww2memories.wordpress.com/2011/09/24/churchills-ww2-speech-to-the-nation-october-1939/).
The Second World War (1939–1945)