When a man, after long years of searching, chances upon a thought which discloses something of the beauty of this mysterious universe, he should not therefore be personally celebrated. He is already sufficiently paid by his experience of seeking and finding.

E=mc2. Energy equals mass times the speed of light squared

As our circle of knowledge expands, so does the circumference of darkness surrounding it.

I do not much believe in education. Each person ought to be his or her own model, however frightful that may be.

There is an atmosphere of well-sounding oratory that likes to attach itself to dress clothes. Away with it!

No one must think that Newton’s great creation can be overthrown in any real sense by this [Theory of Relativity] or by any other theory. His clear and wide ideas will for ever retain their significance as the foundation on which our modern conceptions of physics have been built.

Don't wait for miracles, your whole life is a miracle.