I am strongly drawn to a frugal life and am often oppressively aware that I am engrossing an undue amount of the labor of my fellow men.

I have always disliked the fierce competitive spirit embodied in that highly intellectual game.

No idea is conceived in our mind independent of our five senses [i.e., no idea is divinely inspired].

If I were wrong, wouldn't one be enough?

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.

Solutions to tough problems should be made as simple as possible - and no simpler.

Those who manage their way into a crisis are not necessarily the right people to manage their way out of a crisis