You imagine that I look back on my life's work with calm satisfaction. But from nearby it looks quite different. There is not a single concept of which I am convinced that it will stand firm, and I feel uncertain whether I am in general on the right track.
That which arises dependent on something is not in the least that thing, neither is it different from it. Therefore, it is neither permanent or nothing.
A theory is the more impressive the greater is the simplicity of its premises, the more different are the kinds of things it relates and the more extended the range of its applicability.
We walked to meet each other up at the time of our love and then we have been irresistibly drifting in different directions, and there's no altering that.
Infatuation was a good thing. It gave spice to life, and added to its enjoyment... But it was different from love. Love was worth everything, and couldn't be exchanged for anything.
My opinion about Miller's experiments is the following. ... Should the positive result be confirmed, then the special theory of relativity and with it the general theory of relativity, in its current form, would be invalid. Experimentum summus judex. Only the equivalence of inertia and gravitation would remain, however, they would have to lead to a significantly different theory.