In physics the truth is rarely perfectly clear, and that is certainly universally the case in human affairs. Hence, what is not surrounded by uncertainty cannot be the truth.

Science is uncertain.

While I am describing to you how Nature works, you won't understand why Nature works that way. But you see, nobody understands that.

Scientists are explorers. Philosophers are tourists.

I believe that a scientist looking at nonscientific problems is just as dumb as the next guy.

I don't feel frightened by not knowing things, by being lost in the mysterious universe without any purpose - which is the way it really is, as far as I can tell. Possibly. It doesn't frighten me.

Philosophers say a great deal about what is absolutely necessary for science, and it is always, so far as one can see, rather naive, and probably wrong.