Truth is something that we can attempt to doubt, and then perhaps, after much exertion, discover that part of the doubt is not justified.

If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.

And anyone who thinks they can talk about quantum theory without feeling dizzy hasn't yet understood the first thing about it.

Einstein, stop telling God what to do!

Anybody who is not shocked by this subject has failed to understand it. [of quantum mechanics]

Those who are not shocked when they first come across quantum theory cannot possibly have understood it.

Oh what idiots we have all been, this is just as it must be