The Feynman Lectures
To live with doubt and uncertainty... Are you looking for the ultimate laws of physics? No, I’m not. I am just looking to find out more about the universe. And if it turns out that there is a simple ultimate law, so be it. That would be very nice to discover. . . I don’t believe the special stories that have been made out about our relationship to the universe at large because they seem to be too local, too provincial.
... To me, a very fundamental part of my soul is to doubt, and to ask ...
... I can live with doubt, and uncertainty, and not knowing. I think it is much more interesting to live not knowing than to have answers that might be wrong. I have approximate answers and possible beliefs with different degrees of certainty about different things but I am not absolutely sure of anything. And there are many things that I don’t know anything about. 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 does not frighten me.