Classical physics has been superseded by quantum theory: quantum theory is verified by experiments. Experiments must be described in terms of classical physics. Carl Friedrich von Weizsacker More Quotes by Carl Friedrich von Weizsacker More Quotes From Carl Friedrich von Weizsacker Democracy means decision by those concerned. Carl Friedrich von Weizsacker freedom decision mean Nature is earlier than man, but man is earlier than natural science. Carl Friedrich von Weizsacker nature men science