Known as the "God Letter," the correspondence offers insights into the private thoughts about religion, God and tribalism of one of the world's most brilliant minds.
"This letter, in my opinion, is really of historical and cultural significance as these are the personal and private thoughts of arguably the smartest man of the 20th century," said Eric Gazin, the president of Auction Cause, a Los Angeles-based premier auction agency, which will handle the sale on eBay.
