Time has no independent existence apart from the order of events by which we measure it.

Classical thermodynamics ... is the only physical theory of universal content which I am convinced ... will never be overthrown.

To be sure, it is not the fruits of scientific research that elevate a man and enrich his nature, but the urge to understand, the intellectual work, creative or receptive.

In my relativity theory I set up a clock at every point in space, but in reality I find it difficult to provide even one clock in my room.

Those who staying with the wrong reward,(eg. stay in comfort zone, etc.), long enough will get problem.

An attempt at visualizing the Fourth Dimension: Take a point, stretch it into a line, curl it into a circle, twist it into a sphere, and punch through the sphere.

I was just more stubborn and more passionate than most about physics.