I have been reading the wonderful biography of Arthur Koestler by Michael Scammell, Koestler: The Literary and Political Odyssey Of a Twentieth-Century Skeptic (NY: random House, 2009). See the NYTimes Book Review here. Many years ago I remember reading Janus in one sitting, into the wee hours, and feeling a profound sense of mystical wonder as I finished. I wrote in the inside cover–rather naively I suppose–“This might prove to be the most influential book I have yet encountered.” I have posted previously on various bits and pieces of Koestler or Koestler related thoughts and meditations, here are a few links: Parts & Whole, Visiting the Messiah, On the Convert.
Here is a lovely quotation on Koestler’s restless quest for meaning:
If we can speak about the Central European intellectual at all it is because of the personality of Arthur Koestler. His Jewish-Hugaro-Czech origins are a sort of advance warning that explains all his researches and his ambiguity: from }udaism to the theory of assimilation, from Marxism to the absolute negation of communism, from the flirtation with eastern spiritualism to its demystification, from faith in science to doubt of all closed systems, and from the search for the absolute to serene resignation in the face of man’s critical aptitudes.