Moses is now the oldest surviving animal on the farm and he talks about having seen and heard of revolution for days gone by and he stands by his creed to change nothing in his life because he believes that no matter who is in charge nothing ever changes. As the story unfolds we can see that his beliefs that nothing changes is true. At first things seemed to be better, but in the end they were the same and eventually they were worse, but since Moses changed nothing, his life was far from altered by the events that took place on the farm. He was old enough to know that the faces might change, but the problems stay the same and there is no such thing as a perfect world. He has learned to be content with whatever his world looks like.
As his name suggests, Moses represents religion, a promise for a better life in the "afterlife." Marx called religion the opiate of the people because it took their attention away from their struggle against owners of capital-their "masters." If the animals are seduced by the promises of Moses, they might not join in the rebellion against Jones but instead think only of a new life after the arduous one they now lead. During the middle ages, Christianity preached that a difficult life on earth would be rewarded by an eternity in heaven--such is not the stuff that makes for revolution.