When we try to understand things in their reality, if we analyse far enough, we are confronted by a mysterious fact, seemingly a contradiction. Swami Vivekananda unravels the greatest mystery of the Universe, of existence itself, in this lecture delivered in Los Angeles, California on 5th Jan 1900 titled 'The Open Secret'.  

This Lecture is available in the 2nd Vol. of Complete Works of Swami Vivekananda