It's a misquote - a paraphrase from a passage in Emma Goldman's autobiography, "Living My Life" (published 1931). She recalls being criticised for enjoying a dance: she was told it was undignified, for someone in her position within an anarchist movement, to dance and enjoy herself. She actually said something like "mind your own business!" The snappy quote we have today is from the 1970's. No-one would want to support a cause which ultimately stifles them.

It's a quote that is attributed to Emma Goldman, a revolutionary woman in US history. Search that quote with her name and you can read more about her and that quote. I think back then someone told her that revolutionary people should be serious because they are fighting for the "cause", but she felt that it was good and proper to have fun, too.

This sounds like a shot at religion, possibly Islam of the crackpots in Iran. They tend to forbid everything, and some Muslims think dancing is a sin and disgrace to God. But normal people don't want anything to do with these fanatics. "If I can't dance, I don't want your revolution."" A pretty nice answer to those Iranian nutjobs.