So I looked it up, and the scientist happened to be J. Robert Oppenheimer, who said in a TV interview:
We knew the world would not be the same. A few people laughed, a few people cried. Most people were silent. I remembered the line from the Hindu scripture, the Bhagavad Gita; Vishnu is trying to persuade the Prince that he should do his duty and, to impress him, takes on his multi-armed form and says, 'Now I am become Death, the destroyer of worlds.' I suppose we all thought that, one way or another.Besides the brilliant insight into the development of nuclear weapons, I was surprised to find out that the quote was from the story in the Bhagavad Gita that we learned about in Humanities and thought it was cool that I know exactly what he was talking about.