"All animals are equal, but some animals are more equal than others" is a quote from Animal Farm, a satirical novel by George Orwell.
The quote is a comment on the hypocrisy of governments that claim to be equal to their citizens, but give power and privileges to a small elite. The quote is an example of a paradox, because equality means that everyone is on the same level, and it is not possible for someone to be "more equal" than someone else.