This quote is from George Orwell's novel Animal Farm, which is an allegory for the Russian Revolution. The quote is spoken by the animals of the farm, who are talking about the concept of human beings having power over them. The quote is indicated to represent the concept that humans are not to be trusted and that animals need to be in control of their own lives. The phrase "4 legs excellent, two legs bad" is a method of expressing the concept that animals are much better than humans, and that human beings should not remain in control. This quote is a suggestion that animals need to be respected which humans ought to not be provided excessive power. It is a reminder that animals need to be offered the exact same rights and respect as human beings, and that humans should not be provided excessive power over animals.