Even if you have to go through hell - go without hesitation.

I have tried 99 times and have failed, but on the 100th time came success.

I never said half the crap people said I did.

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.

Pure mathematics is, in its way, the poetry of logical ideas.

Nature shows us only the tail of the lion. But there is no doubt in my mind that the lion belongs with it even if he cannot reveal himself to the eye all at once because of his huge dimension.

Don't be too hard on me. Everyone has to sacrifice at the altar of stupidity from time to time.