And the venality of those Judaized is incapable of explaining anti-Semitism as a social phenomenon, we will call it the anti-Semitic theory.

The catastrophist constructs theories, the uniformitarian demolishes them.

Theories then are dangerous things.

Our mistake is not that we take our theories too seriously, but that we do not take them seriously enough.

There is no complete theory of anything.

Frankly, these days, without a theory to go with it, I can't see painting.

Very simple was my explanation, and plausible enough---as most wrong theories are!

Events in the train of prophecy that had their fulfillment away in the past are made future, and thus by these theories the faith of some is undermined.

I am not limiting myself to theories, so I never question the rightness to my approach.

Einstein explained his theory to me every day, and on my arrival I was fully convinced that he understood it.