Quote by Werner Heisenberg
"What is real is that which can in principle be determined."
More from Werner Heisenberg
"What we observe is not nature itself, but nature exposed to our method of questioning."
"The first gulp from the glass of natural sciences will turn you into an atheist, but God is waiting for you at the bottom of the glass."
"An expert is a person who has made all the mistakes that can be made in his field."
"I think that modern physics has definitely decided in favor of Plato. In fact the smallest units of matter are not physical objects in the ordinary sense; they are forms, ideas which can be expressed unambiguously only in mathematical language."