I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than have answers which might be wrong. I have approximate answers and possible beliefs and different degrees of certainty about different things, but not absolutely sure of anything, and many things 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 the 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. - Richard Feynman
http://www.youtube.com/watch?v=_MmpUWEW6Is