Which passage describes one theme in Animal Farm?

In my opinion, you have to go to the last chapter or the
first to capture a whole passage that would describe the theme that all people are born
with human rights and deserve the opportunities to pursue those rights to whatever
degree they choose. Quite simply, humans deserve life, liberty, and the pursuit of
happiness. In other words, man should be treated equally.

A
passage that clearly illustrates this is the beginning of Old Major's speech. He points
out that happiness is far from their circumstances as they are bound to serve their
master. These living conditions, he says, are
unacceptable.

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"Now, comrades, what is the nature of this life
of ours? Let us face it: our lives are miserable, laborious, and short. We are born, we
are given just so much food as will keep the breath in our bodies, and those of
us 
who are capable of it are forced to work to the last atom of our
strength; and the very instant that our usefulness has come to an end we are slaughtered
with hideous cruelty. No animal in England knows the meaning of happiness or leisure
after he is a year old. No animal in England is free. The life of an animal is misery
and slavery: that is the plain truth. 

"But is this simply part of the
order of nature? Is it because this land of ours is so poor that it cannot afford a
decent life to those who dwell upon it? No, comrades, a thousand times no! The soil of
England is fertile, its climate is good, it is capable of affording food in abundance to
an enormously greater number of animals than now inhabit it. This single farm of ours
would support a dozen horses, twenty cows, hundreds of 
sheep--and all of them
living in a comfort and a dignity that are now almost beyond our imagining. Why then do
we continue in this miserable condition? Because nearly the whole of the produce of our
labour is stolen 
from us by human beings. There, comrades, is the answer to
all our problems. It is summed up in a single word--Man. Man is the only real enemy we
have. Remove Man from the scene, and the root cause of hunger and 
overwork is
abolished for ever.

Old Major
used logic in this second paragraph to prove the fruitfulness of the farm that they
work. He then positions the animals to the point on which he wants them to agree: they
have a common enemy, Man. Since this is an allegory, we must understand that Man
represents a repressive government.

This novel, in
particular, gives merit to the questions of the peoples of all nations for their
governments. Governments should be able to prove that they are acting on behalf of the
people, not becoming fat hogs themselves. The end of the book takes this theme and gives
it fair warning: the pigs who caused the revolt actually became human by the end. This
means that when people do start to question their governments they may become entirely
involved in creating new government, but when they do so, they must remember not to
re-create what they had intended to escape.