The Bhagavad-gita verse Srila Prabhupada lectured most from was 7.1, in which Lord Krsna instructs us to become “free from doubt.” In a lecture he once told us, “if you are advanced in Krsna consciousness, you must be free from all doubts. You must know perfectly well what is Krsna. So that is also possible by devotional service.” (Los Angeles, 25 August 1972.)