W. Heisenberg (1901-1976): When I meet God, I am going to ask him two questions: Why relativity ? And why turbulence ? I really believe he will have an answer for the first.
Ernest Rutherfold: All science is either physics or stamp collecting (只有物理学是科学，所有其它学科都是集邮).
Paul Dirac: A physical theory must possess mathematical beauty.
Sir Arthur Eddington: For the truth of the conclusions of physical science, observation is the supreme Court of Appeal.
M. Planck: ……，我以前同现在一样，相信物理定律越带普遍性，就越是简单。
N. Bohr 对他的老师E. Rutherfold 的评价：他的一生的一切方面都有同他所声称的、大自然所具有的、同样的简单性特性，这个自然界的简单性他能够发现而别的人就不能发现，别的人以前就不能看出来。
EM Lifshitz 对LD Landau 的评价：Landau’s work in science was always such as to display his striving for clarity, his efforts to make simple what was complex and so as to reveal the laws of nature in their true simplicity and beauty.
Einstein: God does not play dice.
N. Bohr: Einstein, stop telling God what to do.