Oppenheimer never became a Hindu in the traditional sense; he did not join any temple nor pray to any god. He "was really taken by the charm and the general wisdom of the Bhagavad-Gita," his brother said. It is speculated that Oppenheimer's interest in Hindu thought started during his earlier association with Niels Bohr. Both Bohr and Oppenheimer had been very analytical and critical about the ancient Hindu mythological stories and the metaphysics embedded in them. In one conversation with David Hawkins before the war, while talking about the literature of ancient Greece, Oppenheimer remarked, "I have read the Greeks; I find the Hindus deeper." During the 1930s, while teaching at Berkeley, Oppenheimer became part of a group in the Bay Area that psychologist Siegfried Bernfeld convened to discuss psychoanalysis.