India-born former Goldman Sachs director Rajat Gupta, who served 19 months in US jail for insider trading, Tuesday said he fell back on Bhagavad Gita during his stint in the prison. Gupta was sentenced to two years in prison after being found guilty in 2012 of passing confidential boardroom information about Goldman Sachs to the then hedge fund manager and founder of the Galleon Group Raj Rajaratnam, who was sentenced to 11 years in prison for insider trading. "I had Bhagavad Gita with me (in prison)....