Feynman Lectures on Physics

If we’re told that the same experiment will always produce the same result, that is all very well, but if, when we try it, it does not, then it does not. We just take what we see, then formulate all the rest of our ideas in terms of actual experience.

It is not possible to predict exactly what will happen in any circumstance.

Miss but an hour's fated meeting, and lifetimes pass before next greeting.