Uppaluri Gopala Krishnamurti (9 July 1918 – 22 March 2007) was a philosopher who questioned the state of spiritual enlightenment. Having pursued a religious path in his youth and eventually rejecting it, U.G. claimed to have experienced a devastating biological transformation on his 49th birthday, an event he refers to as "the calamity". He emphasized that this transformation back to "the natural state" is a rare, acausal, biological occurrence with no religious context. He rejected the very basis of thought and in doing so negated all systems of thought and knowledge. Hence he explained his assertions were experiential and not speculative – "Tell them that there is nothing to understand.". KiranPrabha narrates the interesting life sketch of UG in this episode.