If we ever do find a complete theory of the universe, it would be a great triumph of human reason but it wouldn't leave much for us to do. We need an intellectual challenge.
To boldly go where no one has gone before
I think the human race has no future if it doesn't go into space.
Don't be disabled in spirit as well as physically.
I am discounting the reports of UFOs. Why would they appear only to cranks and weirdos?
My first popular book, 'A Brief History of Time,' aroused a great deal of interest, but many found it difficult to understand.