Put all the theologians in history together, and their contribution to understanding the universe would not even approach those made by this man. And, unlike theologians, when Feynman didn’t know something, he admitted it.

“When you doubt and ask, it gets a little harder to believe. You see, one thing is that I can live with doubt and uncertainty, and not knowing. I think it’s much more interesting to live not knowing than to have answers which might be wrong. . . But I don’t have to know an answer; I don’t feel frightened by not knowing things—by being lost in a mysterious universe without having any purpose, which is the way it really is as far as I can tell, possibly. It doesn’t frighten me.”