I would rather have questions that can't be answered than answers that can't be questioned.

If it disagrees with experiment, it's wrong.

[Quantum mechanics] describes nature as absurd from the point of view of common sense. And yet it fully agrees with experiment. So I hope you can accept nature as She is - absurd.

Words can be meaningless. If they are used in such a way that no sharp conclusions can be drawn.

We have been led to imagine all sorts of things infinitely more marvelous than the imagining of poets and dreamers of the past. It shows that the imagination of nature is far, far greater than the imagination of man. For instance, how much more remarkable it is for us all to be stuck-half of us upside down-by a mysterious attraction, to a spinning ball that has been swinging in space for billions of years, than to be carried on the back of an elephant supported on a tortoise swimming in a bottomless sea.

Scientific knowledge is an enabling power to do either good or bad — but it does not carry instructions on how to use it.

I learned very early the difference between knowing the name of something and knowing something.