All we know so far is what doesn't work.

Words can be meaningless. If they are used in such a way that no sharp conclusions can be drawn.

No one really understands quantum mechanics.

It is scientific only to say what is more likely and what less likely, and not to be proving all the time the possible and impossible.

Phenomena complex-laws simple....Know what to leave out.

Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question - to doubt - to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.

When things are going well, something will go wrong. / When things just can't get any worse, they will. / Anytime things appear to be going better, you have overlooked something.